Bump-Stock-Type Devices

Published date26 December 2018
Citation83 FR 66514
Record Number2018-27763
SectionRules and Regulations
CourtAlcohol, Tobacco, Firearms, And Explosives Bureau
Federal Register, Volume 83 Issue 246 (Wednesday, December 26, 2018)
[Federal Register Volume 83, Number 246 (Wednesday, December 26, 2018)]
                [Rules and Regulations]
                [Pages 66514-66554]
                From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
                [FR Doc No: 2018-27763]
                [[Page 66513]]
                Vol. 83
                Wednesday,
                No. 246
                December 26, 2018
                Part IVDepartment of Justice-----------------------------------------------------------------------Bureau of Alcohol, Tobacco, Firearms, and Explosives-----------------------------------------------------------------------27 CFR Parts 447, 478, and 479Bump-Stock-Type Devices; Rule
                Federal Register / Vol. 83 , No. 246 / Wednesday, December 26, 2018 /
                Rules and Regulations
                [[Page 66514]]
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                DEPARTMENT OF JUSTICE
                Bureau of Alcohol, Tobacco, Firearms, and Explosives
                27 CFR Parts 447, 478, and 479
                [Docket No. 2018R-22F; AG Order No. 4367-2018]
                RIN 1140-AA52
                Bump-Stock-Type Devices
                AGENCY: Bureau of Alcohol, Tobacco, Firearms, and Explosives;
                Department of Justice.
                ACTION: Final rule.
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                SUMMARY: The Department of Justice is amending the regulations of the
                Bureau of Alcohol, Tobacco, Firearms, and Explosives (ATF) to clarify
                that bump-stock-type devices--meaning ``bump fire'' stocks, slide-fire
                devices, and devices with certain similar characteristics--are
                ``machineguns'' as defined by the National Firearms Act of 1934 and the
                Gun Control Act of 1968 because such devices allow a shooter of a
                semiautomatic firearm to initiate a continuous firing cycle with a
                single pull of the trigger. Specifically, these devices convert an
                otherwise semiautomatic firearm into a machinegun by functioning as a
                self-acting or self-regulating mechanism that harnesses the recoil
                energy of the semiautomatic firearm in a manner that allows the trigger
                to reset and continue firing without additional physical manipulation
                of the trigger by the shooter. Hence, a semiautomatic firearm to which
                a bump-stock-type device is attached is able to produce automatic fire
                with a single pull of the trigger. With limited exceptions, the Gun
                Control Act, as amended, makes it unlawful for any person to transfer
                or possess a machinegun unless it was lawfully possessed prior to the
                effective date of the statute. The bump-stock-type devices covered by
                this final rule were not in existence prior to the effective date of
                the statute, and therefore will be prohibited when this rule becomes
                effective. Consequently, under the final rule, current possessors of
                these devices will be required to destroy the devices or abandon them
                at an ATF office prior to the effective date of the rule.
                DATES: This rule is effective March 26, 2019.
                FOR FURTHER INFORMATION CONTACT: Vivian Chu, Office of Regulatory
                Affairs, Enforcement Programs and Services, Bureau of Alcohol, Tobacco,
                Firearms, and Explosives, U.S. Department of Justice, 99 New York Ave.
                NE, Washington, DC 20226; telephone: (202) 648-7070.
                SUPPLEMENTARY INFORMATION:
                I. Executive Summary
                 A. Summary of the Regulatory Action
                 B. Summary of Costs and Benefits
                II. Background
                 A. Regulatory Context
                 B. Las Vegas Shooting
                 C. Advance Notice of Proposed Rulemaking
                III. Notice of Proposed Rulemaking
                 A. Prior Interpretations of ``Single Function of the Trigger''
                and ``Automatically''
                 B. Re-Evaluation of Bump-Stock-Type Devices
                 C. Proposed Definition of ``Single Function of the Trigger''
                 D. Proposed Definition of ``Automatically''
                 E. Proposed Clarification That the Definition of ``Machinegun''
                Includes Bump-Stock-Type Devices
                 F. Amendment of 27 CFR 479.11
                 G. Amendment of 27 CFR 478.11
                 H. Amendment of 27 CFR 447.11
                IV. Analysis of Comments and Department Responses for Proposed Rule
                 A. Comments Generally Supporting the Rule
                 B. Particular Reasons Raised in Support of the Rule
                 C. Comments Generally Opposing the Rule
                 D. Specific Issues Raised in Opposition to the Rule
                 E. ATF Suggested Alternatives
                 F. Other Alternatives
                 G. Proposed Rule's Statutory and Executive Order Review
                 H. Affected Population
                 I. Costs and Benefits
                 J. Regulatory Flexibility Act
                 K. Miscellaneous Comments
                 L. Comments on the Rulemaking Process
                V. Final Rule
                VI. Statutory and Executive Order Review
                 A. Executive Orders 12866, 13563, and 113771
                B. Executive Order 113132
                C. Executive Order 112988
                D. Regulatory Flexibility Act
                 E. Small Business Regulatory Enforcement Fairness Act of 1996
                 F. Congressional Review Act
                 G. Unfunded Mandates Reform Act of 1995
                 H. Paperwork Reduction Act of 1995
                I. Executive Summary
                A. Summary of the Regulatory Action
                 The current regulations at Sec. Sec. 447.11, 478.11, and 479.11 of
                title 27, Code of Federal Regulations (CFR), contain definitions for
                the term ``machinegun.'' \1\ The definitions used in 27 CFR 478.11 and
                479.11 match the statutory definition of ``machinegun'' in the National
                Firearms Act of 1934 (NFA), as amended, and the Gun Control Act of 1968
                (GCA), as amended. Under the NFA, the term ``machinegun'' means ``any
                weapon which shoots, is designed to shoot, or can be readily restored
                to shoot, automatically more than one shot, without manual reloading,
                by a single function of the trigger.'' 26 U.S.C. 5845(b). The term
                ``machinegun'' also includes ``the frame or receiver of any such
                weapon'' or any part or combination of parts designed and intended
                ``for use in converting a weapon into a machinegun,'' and ``any
                combination of parts from which a machinegun can be assembled if such
                parts are in the possession or under the control of a person.'' Id.
                This definition uses the key terms ``single function of the trigger''
                and ``automatically,'' but these terms are not defined in the statutory
                text.
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                 \1\ Regulations implementing the relevant statutes spell the
                term ``machine gun'' rather than ``machinegun.'' E.g., 27 CFR
                478.11, 479.11. For convenience, this notice uses ``machinegun''
                except when quoting a source to the contrary.
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                 The definition of ``machinegun'' in 27 CFR 447.11, promulgated
                pursuant to the portion of section 38 of the Arms Export Control Act
                (AECA) (22 U.S.C. 2778) delegated to the Attorney General by section
                1(n)(ii) of Executive Order 13637 (78 FR 16129), is similar. Currently,
                the definition of ``machinegun'' in Sec. 447.11 provides that a
                ```machinegun', `machine pistol', `submachinegun', or `automatic rifle'
                is a firearm originally designed to fire, or capable of being fired
                fully automatically by a single pull of the trigger.''
                 In 2006, ATF concluded that certain bump-stock-type devices
                qualified as machineguns under the NFA and GCA. Specifically, ATF
                concluded that a device attached to a semiautomatic firearm that uses
                an internal spring to harness the force of a firearm's recoil so that
                the firearm shoots more than one shot with a single pull of the trigger
                is a machinegun. Between 2008 and 2017, however, ATF also issued
                classification decisions concluding that other bump-stock-type devices
                were not machineguns, primarily because the devices did not rely on
                internal springs or similar mechanical parts to channel recoil energy.
                Decisions issued during that time did not include extensive legal
                analysis relating to the definition of ``machinegun.'' ATF undertook a
                review of its past classifications and determined that those
                conclusions did not reflect the best interpretation of ``machinegun''
                under the NFA and GCA.
                 ATF decided to promulgate a rule that would bring clarity to the
                definition of ``machinegun''--specifically with respect to the terms
                ``automatically'' and ``single function of the trigger,'' as those
                terms are used to define ``machinegun.'' As an initial step in the
                process of promulgating a rule, on December 26, 2017, the Department of
                Justice (Department) published in the Federal
                [[Page 66515]]
                Register an advance notice of proposed rulemaking titled ``Application
                of the Definition of Machinegun to `Bump Fire' Stocks and Other Similar
                Devices.'' 82 FR 60929. Subsequently, on March 29, 2018, the Department
                published in the Federal Register a notice of proposed rulemaking
                (NPRM) titled ``Bump-Stock-Type Devices.'' 83 FR 13442.
                 The NPRM proposed to amend the regulations at 27 CFR 447.11,
                478.11, and 479.11 to clarify that bump-stock-type devices are
                ``machineguns'' as defined by the NFA and GCA because such devices
                allow a shooter of a semiautomatic firearm to initiate a continuous
                firing cycle with a single pull of the trigger. Specifically, these
                devices convert an otherwise semiautomatic firearm into a machinegun by
                functioning as a self-acting or self-regulating mechanism that
                harnesses the recoil energy of the semiautomatic firearm in a manner
                that allows the trigger to reset and continue firing without additional
                physical manipulation of the trigger by the shooter. Hence, a
                semiautomatic firearm to which a bump-stock-type device is attached is
                able to produce automatic fire with a single pull of the trigger. 83 FR
                at 13447-48.
                 The NPRM proposed regulatory definitions for the statutory terms
                ``single function of the trigger'' and ``automatically,'' and
                amendments of the regulatory definition of ``machinegun'' for purposes
                of clarity. Specifically, the NPRM proposed to amend the definitions of
                ``machinegun'' in Sec. Sec. 478.11 and 479.11, define the term
                ``single function of the trigger'' to mean ``single pull of the
                trigger,'' and define the term ``automatically'' to mean ``as the
                result of a self-acting or self-regulating mechanism that allows the
                firing of multiple rounds through a single pull of the trigger.'' 83 FR
                at 13447-48. The NPRM also proposed to clarify that the definition of
                ``machinegun'' includes a device that allows a semiautomatic firearm to
                shoot more than one shot with a single pull of the trigger by
                harnessing the recoil energy of the semiautomatic firearm to which it
                is affixed so that the trigger resets and continues firing without
                additional physical manipulation of the trigger by the shooter
                (commonly known as bump-stock-type devices). Id. at 13447. Finally, the
                NPRM proposed to harmonize the definition of ``machinegun'' in Sec.
                447.11 with the definitions in 27 CFR parts 478 and 479, as those
                definitions would be amended. Id. at 13448.
                 The goal of this final rule is to amend the relevant regulatory
                definitions as described above. The Department, however, has revised
                the definition of ``single function of the trigger'' to mean ``single
                pull of the trigger'' and analogous motions, taking into account that
                there are other methods of initiating an automatic firing sequence that
                do not require a pull. This final rule also informs current possessors
                of bump-stock-type devices of the proper methods of disposal, including
                destruction by the owner or abandonment to ATF.
                B. Summary of Costs and Benefits
                 ATF estimates the total undiscounted cost of this rule at $312.1
                million over 10 years. The total 7% discount cost is estimated at
                $245.5 million, and the discounted costs would be $32.8 million and
                $35.0 million, annualized at 3% and 7% respectively. The estimate
                includes costs to the public for loss of property ($102.5 million);
                costs of forgone future production and sales ($198.9 million); costs of
                disposal ($9.4 million); and government costs ($1.3 million).
                Unquantified costs include potential loss of wages for employees of
                bump-stock-type device manufacturers, notification to bump-stock-type
                device owners of the need to destroy the devices, and loss of future
                usage by the owners of bump-stock-type devices. ATF did not calculate
                any cost savings for this final rule.
                 This final rule clarifies that bump-stock-type devices are
                machineguns that are subject to the NFA and GCA. The provisions of
                those statutes addressing machineguns are designed to increase public
                safety by, among other things, limiting legal access to them.
                Consistent with the NFA and GCA, therefore, a desired outcome of this
                final rule is increased public safety.
                II. Background
                A. Regulatory Context
                 The Attorney General is responsible for enforcing the NFA, as
                amended, and the GCA, as amended.\2\ This responsibility includes the
                authority to promulgate regulations necessary to enforce the provisions
                of the NFA and GCA. See 18 U.S.C. 926(a); 26 U.S.C. 7801(a)(2)(A),
                7805(a). The Attorney General has delegated the responsibility for
                administering and enforcing the NFA and GCA to the Director of ATF,
                subject to the direction of the Attorney General and the Deputy
                Attorney General. See 28 CFR 0.130(a)(1)-(2). Accordingly, the
                Department and ATF have promulgated regulations implementing both the
                NFA and the GCA. See 27 CFR parts 478, 479. In particular, ATF for
                decades promulgated rules governing ``the procedural and substantive
                requirements relative to the importation, manufacture, making,
                exportation, identification and registration of, and the dealing in,
                machine guns.'' 27 CFR 479.1; see, e.g., United States v. Dodson, 519
                F. App'x 344, 348-49 & n.4 (6th Cir. 2013) (acknowledging ATF's role in
                interpreting the NFA's definition of ``machinegun''); F.J. Vollmer Co.
                v. Higgins, 23 F.3d 448, 449-51 (D.C. Cir. 1994) (upholding an ATF
                determination regarding machinegun receivers). Courts have recognized
                ATF's leading regulatory role with respect to firearms, including in
                the specific context of classifying devices as machineguns under the
                NFA. See, e.g., York v. Sec'y of Treasury, 774 F.2d 417, 419-20 (10th
                Cir. 1985).
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                 \2\ NFA provisions still refer to the ``Secretary of the
                Treasury.'' 26 U.S.C. ch. 53. However, the Homeland Security Act of
                2002, Public Law 107-296, 116 Stat. 2135, transferred the functions
                of ATF from the Department of the Treasury to the Department of
                Justice, under the general authority of the Attorney General. 26
                U.S.C. 7801(a)(2); 28 U.S.C. 599A(c)(1). Thus, for ease of
                reference, this notice refers to the Attorney General.
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                 The GCA defines ``machinegun'' by referring to the NFA
                definition,\3\ which includes ``any weapon which shoots, is designed to
                shoot, or can be readily restored to shoot, automatically more than one
                shot, without manual reloading, by a single function of the trigger.''
                26 U.S.C. 5845(b). The term ``machinegun'' also includes ``the frame or
                receiver of any such weapon'' or any part, or combination of parts,
                designed and intended ``for use in converting a weapon into a
                machinegun,'' and any combination of parts from which a machinegun can
                be assembled if such parts are in the possession or under the control
                of a person. Id. With limited exceptions, the GCA prohibits the
                transfer or possession of machineguns under 18 U.S.C. 922(o).
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                 \3\ 18 U.S.C. 921(a)(23).
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                 In 1986, Congress passed the Firearms Owners' Protection Act
                (FOPA), Public Law 99-308, 100 Stat. 449, which included a provision
                that effectively froze the number of legally transferrable machineguns
                to those that were registered before the effective date of the statute.
                18 U.S.C. 922(o). Due to the fixed universe of ``pre-1986'' machineguns
                that may be lawfully transferred by nongovernmental entities, the value
                of those machineguns has steadily increased over time. This price
                premium on automatic weapons has spurred inventors and manufacturers to
                develop firearms, triggers, and other devices that permit shooters to
                use semiautomatic rifles to replicate
                [[Page 66516]]
                automatic fire without converting these rifles into ``machineguns''
                under the NFA and GCA. ATF began receiving classification requests for
                such firearms, triggers, and other devices that replicate automatic
                fire beginning in 1988. ATF has noted a significant increase in such
                requests since 2004, often in connection with rifle models that were,
                until 2004, defined as ``semiautomatic assault weapons'' and prohibited
                under the Public Safety and Recreational Firearms Use Protection Act,
                18 U.S.C. 921(a)(30) (sunset effective Sept. 13, 2004).
                 ATF received classification requests pertaining to bump-stock-type
                devices. Shooters use bump-stock-type devices with semiautomatic
                firearms to accelerate the firearms' cyclic firing rate to mimic
                automatic fire. These devices replace a rifle's standard stock and free
                the weapon to slide back and forth rapidly, harnessing the energy from
                the firearm's recoil either through a mechanism like an internal spring
                or in conjunction with the shooter's maintenance of pressure (typically
                constant forward pressure with the non-trigger hand on the barrel-
                shroud or fore-grip of the rifle, and constant rearward pressure on the
                device's extension ledge with the shooter's trigger finger).
                 In 2006, ATF concluded that certain bump-stock-type devices
                qualified as machineguns under the NFA and GCA. Specifically, ATF
                concluded that devices attached to semiautomatic firearms that use an
                internal spring to harness the force of the recoil so that the firearm
                shoots more than one shot with a single pull of the trigger are
                machineguns. Between 2008 and 2017, however, ATF also issued
                classification decisions concluding that other bump-stock-type devices
                were not machineguns, including a device submitted by the manufacturer
                of the bump-stock-type devices used in the 2017 Las Vegas shooting
                discussed below. Those decisions indicated that semiautomatic firearms
                modified with these bump-stock-type devices did not fire
                ``automatically,'' and thus were not ``machineguns,'' because the
                devices did not rely on internal springs or similar mechanical parts to
                channel recoil energy. (For further discussion of ATF's prior
                interpretations, see Part III.A.) Because ATF has not regulated these
                certain types of bump-stock-type devices as machineguns under the NFA
                or GCA, they have not been marked with a serial number or other
                identification markings. Individuals, therefore, have been able to
                legally purchase these devices without undergoing background checks or
                complying with any other Federal regulations applicable to firearms.
                B. Las Vegas Shooting
                 On October 1, 2017, a shooter attacked a large crowd attending an
                outdoor concert in Las Vegas, Nevada. By using several AR-type rifles
                with attached bump-stock-type devices, the shooter was able to fire
                several hundred rounds of ammunition in a short period of time, killing
                58 people and wounding approximately 500. The bump-stock-type devices
                recovered from the scene included two distinct, but functionally
                equivalent, model variations from the same manufacturer. These types of
                devices were readily available in the commercial marketplace through
                online sales directly from the manufacturer, and through multiple
                retailers.
                 The Las Vegas bump-stock-type devices, as well as other bump-stock-
                type devices available on the market, all utilize essentially the same
                functional design. They are designed to be affixed to a semiautomatic
                long gun (most commonly an AR-type rifle or an AK-type rifle) in place
                of a standard, stationary rifle stock, for the express purpose of
                allowing ``rapid fire'' operation of the semiautomatic firearm to which
                they are affixed. They are configured with a sliding shoulder stock
                molded (or otherwise attached) to a pistol-grip/handle (or ``chassis'')
                that includes an extension ledge (or ``finger rest'') on which the
                shooter places the trigger finger while shooting the firearm. The
                devices also generally include a detachable rectangular receiver module
                (or ``bearing interface'') that is placed in the receiver well of the
                device's pistol-grip/handle to assist in guiding and regulating the
                recoil of the firearm when fired. Bump-stock-type devices, including
                those with the aforementioned characteristics, are generally designed
                to channel recoil energy to increase the rate of fire of a
                semiautomatic firearm from a single trigger pull. Accordingly, when a
                bump-stock-type device is affixed to a semiautomatic firearm, the
                device harnesses and directs the firearm's recoil energy to slide the
                firearm back and forth so that the trigger automatically re-engages by
                ``bumping'' the shooter's stationary finger without additional physical
                manipulation of the trigger by the shooter.
                 Following the mass shooting in Las Vegas, ATF received
                correspondence from members of the United States Congress, as well as
                nongovernmental organizations, requesting that ATF examine its past
                classifications and determine whether bump-stock-type devices available
                on the market constitute machineguns under the statutory definition.
                Consistent with its authority to ``reconsider and rectify'' potential
                classification errors, Akins v. United States, 312 F. App'x 197, 200
                (11th Cir. 2009) (per curiam), ATF reviewed its earlier determinations
                for bump-stock-type devices issued between 2008 and 2017 and concluded
                that those determinations did not include extensive legal analysis of
                the statutory terms ``automatically'' or ``single function of the
                trigger.'' The Department decided to move forward with the rulemaking
                process to clarify the meaning of these terms, which are used in the
                NFA's statutory definition of ``machinegun.''
                C. Advance Notice of Proposed Rulemaking
                 On December 26, 2017, the Department, as an initial step in the
                process of promulgating a Federal regulation interpreting the
                definition of ``machinegun'' with respect to bump-stock-type devices,
                published an advance notice of proposed rulemaking (ANPRM) in the
                Federal Register. Application of the Definition of Machinegun to ``Bump
                Fire'' Stocks and Other Similar Devices, 82 FR 60929. The ANPRM
                solicited comments concerning the market for bump-stock-type devices
                and manufacturer and retailer data. Specifically, the Department asked
                a series of questions of consumers, retailers, and manufacturers of
                bump-stock-type devices regarding the cost of bump-stock-type devices,
                average gross receipts of sales, and the volume and cost of
                manufacturing, as well as input on the potential effect of a rulemaking
                affecting bump-stock-type devices, including viable markets or the cost
                of disposing of inventory. Public comment on the ANPRM concluded on
                January 25, 2018. While ATF received over 115,000 comments, the vast
                majority of these comments were not responsive to the ANPRM.
                 On February 20, 2018, the President issued a memorandum to the
                Attorney General concerning ``bump fire'' stocks and similar devices.
                Application of the Definition of Machinegun to ``Bump Fire'' Stocks and
                Other Similar Devices, 83 FR 7949. The memorandum noted that the
                Department of Justice had already ``started the process of promulgating
                a Federal regulation interpreting the definition of `machinegun' under
                Federal law to clarify whether certain bump stock type devices should
                be illegal.'' Id. The President then directed the Department of
                Justice, working within established legal protocols, ``to dedicate all
                [[Page 66517]]
                available resources to complete the review of the comments received [in
                response to the ANPRM], and, as expeditiously as possible, to propose
                for notice and comment a rule banning all devices that turn legal
                weapons into machineguns.'' Id.
                III. Notice of Proposed Rulemaking
                 On March 29, 2018, the Department published in the Federal Register
                a notice of proposed rulemaking (NPRM) titled ``Bump-Stock-Type
                Devices,'' 83 FR 13442 (ATF Docket No. 2017R-22), proposing changes to
                the regulations in 27 CFR 447.11, 478.11, and 479.11. The comment
                period for the proposed rule concluded on June 27, 2018.
                A. Prior Interpretations of ``Single Function of the Trigger'' and
                ``Automatically''
                 In the NPRM, the Department reviewed ATF's history of classifying
                bump-stock-type devices through agency rulings and relevant litigation.
                In particular, it described how ATF published ATF Ruling 2006-2,
                ``Classification of Devices Exclusively Designed to Increase the Rate
                of Fire of a Semiautomatic Firearm.'' The ruling explained that ATF had
                received requests from ``several members of the firearms industry to
                classify devices that are exclusively designed to increase the rate of
                fire of a semiautomatic firearm.'' ATF Ruling 2006-2, at 1. Prior to
                issuing ATF Ruling 2006-2, ATF had examined a device called the ``Akins
                Accelerator.'' To operate the device, the shooter initiated an
                automatic firing sequence by pulling the trigger one time, which in
                turn caused the rifle to recoil within the stock, permitting the
                trigger to lose contact with the finger and manually reset. Springs in
                the Akins Accelerator then forced the rifle forward, forcing the
                trigger against the finger, which caused the weapon to discharge the
                ammunition. The recoil and the spring-powered device thus caused the
                firearm to cycle back and forth, impacting the trigger finger without
                further input by the shooter while the firearm discharged multiple
                shots. The device was advertised as able to fire approximately 650
                rounds per minute. See id. at 2.
                 ATF initially reviewed the Akins Accelerator in 2002 and determined
                it not to be a machinegun because ATF interpreted the statutory term
                ``single function of the trigger'' to refer to a single movement of the
                trigger. But ATF undertook further review of the device based on how it
                actually functioned when sold and later determined that the Akins
                Accelerator should be classified as a machinegun. ATF reached that
                conclusion because the best interpretation of the phrase ``single
                function of the trigger'' includes a ``single pull of the trigger.''
                The Akins Accelerator qualified as a machinegun because ATF determined
                through testing that when the device was installed on a semiautomatic
                rifle (specifically a Ruger Model 10-22), it resulted in a weapon that
                ``[with] a single pull of the trigger initiates an automatic firing
                cycle that continues until the finger is released, the weapon
                malfunctions, or the ammunition supply is exhausted.'' Akins v. United
                States, No. 8:08-cv-988, slip op. at 5 (M.D. Fla. Sept. 23, 2008)
                (internal quotation marks omitted).
                 When issuing ATF Ruling 2006-2, ATF set forth a detailed
                description of the components and functionality of the Akins
                Accelerator and devices with similar designs. The ruling determined
                that the phrase ``single function of the trigger'' in the statutory
                definition of ``machinegun'' was best interpreted to mean a ``single
                pull of the trigger.'' ATF Ruling 2006-2, at 2 (citing National
                Firearms Act: Hearings Before the Comm. on Ways and Means, House of
                Representatives, Second Session on H.R. 9066, 73rd Cong., at 40
                (1934)). ATF further indicated that this interpretation would apply
                when the agency classified devices designed to increase the rate of
                fire of semiautomatic firearms. Thus, ATF concluded in ATF Ruling 2006-
                2 that devices exclusively designed to increase the rate of fire of
                semiautomatic firearms were machineguns if, ``when activated by a
                single pull of the trigger, [such devices] initiate[ ] an automatic
                firing cycle that continues until either the finger is released or the
                ammunition supply is exhausted.'' Id. at 3. Finally, because the
                ``single pull of the trigger'' interpretation constituted a change from
                ATF's prior interpretations of the phrase ``single function of the
                trigger,'' ATF Ruling 2006-2 concluded that ``[t]o the extent previous
                ATF rulings are inconsistent with this determination, they are hereby
                overruled.'' Id.
                 Following its reclassification of the Akins Accelerator as a
                machinegun, ATF determined and advised owners of Akins Accelerator
                devices that removal and disposal of the internal spring--the component
                that caused the rifle to slide forward in the stock--would render the
                device a non-machinegun under the statutory definition. Thus, a
                possessor could retain the device by removing and disposing of the
                spring, in lieu of destroying or surrendering the device.
                 In May 2008, the inventor of the Akins Accelerator filed a lawsuit
                challenging ATF's classification of his device as a machinegun,
                claiming the agency's decision was arbitrary and capricious under the
                Administrative Procedure Act (APA). Akins v. United States, No. 8:08-
                cv-988, slip op. at 7-8 (M.D. Fla. Sept. 23, 2008). The United States
                District Court for the Middle District of Florida rejected the
                plaintiff's challenge, holding that ATF was within its authority to
                reconsider and change its interpretation of the phrase ``single
                function of the trigger'' in the NFA's statutory definition of
                ``machinegun.'' Id. at 14. The court further held that the language of
                the statute and the legislative history supported ATF's interpretation
                of the statutory phrase ``single function of the trigger'' as
                synonymous with ``single pull of the trigger.'' Id. at 11-12. The court
                concluded that in ATF Ruling 2006-2, ATF had set forth a ``reasoned
                analysis'' for the application of that new interpretation to the Akins
                Accelerator and similar devices, including the need to ``protect the
                public from dangerous firearms.'' Id. at 12.
                 The United States Court of Appeals for the Eleventh Circuit
                affirmed the district court's decision, holding that ``[t]he
                interpretation by the Bureau that the phrase `single function of the
                trigger' means a `single pull of the trigger' is consonant with the
                statute and its legislative history.'' Akins, 312 F. App'x at 200. The
                Eleventh Circuit further concluded that ``[b]ased on the operation of
                the Accelerator, the Bureau had the authority to `reconsider and
                rectify' what it considered to be a classification error.'' Id.
                 In ten letter rulings between 2008 and 2017, ATF applied the
                ``single pull of the trigger'' interpretation to other bump-stock-type
                devices. Like the Akins Accelerator, these other bump-stock-type
                devices allowed the shooter to fire more than one shot with a single
                pull of the trigger. However, ATF ultimately concluded that these
                devices did not qualify as machineguns because, in ATF's view, they did
                not ``automatically'' shoot more than one shot with a single pull of
                the trigger. ATF also applied its ``single pull of the trigger''
                interpretation to other trigger actuators, two-stage triggers, and
                other devices submitted to ATF for classification. Depending on the
                method of operation, some such devices were classified to be
                machineguns that were required to be registered in the National
                Firearms Registration and Transfer Record (NFRTR) and could not be
                transferred or possessed, except in
                [[Page 66518]]
                limited circumstances, under 18 U.S.C. 922(o).\4\
                ---------------------------------------------------------------------------
                 \4\ Examples of recent ATF classification letters relying on the
                ``single pull of the trigger'' interpretation to classify submitted
                devices as machineguns include the following:
                 On April 13, 2015, ATF issued a classification letter
                regarding a device characterized as a ``positive reset trigger,''
                designed to be used on a semiautomatic AR-style rifle. The device
                consisted of a support/stock, secondary trigger, secondary trigger
                link, pivot toggle, shuttle link, and shuttle. ATF determined that,
                after a single pull of the trigger, the device utilized recoil
                energy generated from firing a projectile to fire a subsequent
                projectile. ATF noted that ``a `single function of the trigger' is a
                single pull,'' and that the device utilized a ``single function of
                the trigger'' because the shooter need not release the trigger to
                fire a subsequent projectile, and instead ``can maintain constant
                pressure through a single function of the trigger.''
                 On October 7, 2016, ATF issued a classification letter
                regarding two devices described as ``LV-15 Trigger Reset Devices.''
                The devices, which were designed to be used on an AR-type rifle,
                were essentially identical in design and function and were submitted
                by the same requester (per the requester, the second device included
                ``small improvements that have come as the result of further
                development since the original submission''). The devices were each
                powered by a rechargeable battery and included the following
                components: A self-contained trigger mechanism with an electrical
                connection, a modified two-position semiautomatic AR-15 type
                selector lever, a rechargeable battery pack, a grip assembly/trigger
                guard with electrical connections, and a piston that projected
                forward through the lower rear portion of the trigger guard and
                pushed the trigger forward as the firearm cycled. ATF held that ``to
                initiate the firing . . . a shooter must simply pull the trigger.''
                It explained that although the mechanism pushed the trigger forward,
                ``the shooter never releases the trigger. Consistent with [the
                requester's] explanation, ATF demonstrated that the device fired
                multiple projectiles with a ``single function of the trigger''
                because a single pull was all that was required to initiate and
                maintain a firing sequence.
                ---------------------------------------------------------------------------
                 In the NPRM, the Department also noted that prior ATF rulings
                concerning bump-stock-type devices did not provide substantial or
                consistent legal analysis regarding the meaning of the term
                ``automatically,'' as it is used in the NFA and GCA. For example, ATF
                Ruling 2006-2 concluded that devices like the Akins Accelerator
                initiated an ``automatic'' firing cycle because, once initiated by a
                single pull of the trigger, ``the automatic firing cycle continues
                until the finger is released or the ammunition supply is exhausted.''
                ATF Ruling 2006-2, at 1. In contrast, other ATF letter rulings between
                2008 and 2017 concluded that bump-stock-type devices that enable a
                semiautomatic firearm to shoot more than one shot with a single
                function of the trigger by harnessing a combination of the recoil and
                the maintenance of pressure by the shooter do not fire
                ``automatically.'' Of the rulings issued between 2008 and 2017, ATF
                provided different explanations for why certain bump-stock-type devices
                were not machineguns, but none of them extensively examined the meaning
                of ``automatically.'' For instance, some letter rulings concluded that
                certain devices were not machineguns because they did not ``initiate[ ]
                an automatic firing cycle that continues until either the finger is
                released or the ammunition supply is exhausted,'' without further
                defining the term ``automatically.'' E.g., Letter for Michael Smith
                from ATF's Firearm Technology Branch Chief (April 2, 2012). Other
                letter rulings concluded that certain bump-stock-type devices were not
                machineguns because they lacked any ``automatically functioning
                mechanical parts or springs and perform[ed] no mechanical function[s]
                when installed,'' again without further defining the term
                ``automatically'' in this context. E.g., Letter for David Compton from
                ATF's Firearm Technology Branch Chief (June 7, 2010).
                B. Re-Evaluation of Bump-Stock-Type Devices
                 In the NPRM, the Department reviewed the functioning of
                semiautomatic firearms, describing that ordinarily, to operate a
                semiautomatic firearm, the shooter must repeatedly pull and release the
                trigger to allow it to reset, so that only one shot is fired with each
                pull of the trigger. 83 FR at 13443. It then explained that bump-stock-
                type devices, like the ones used in Las Vegas, are designed to channel
                recoil energy to increase the rate of fire of semiautomatic firearms
                from a single trigger pull. Id. Shooters can maintain a continuous
                firing cycle after a single pull of the trigger by directing the recoil
                energy of the discharged rounds into the space created by the sliding
                stock (approximately 1.5 inches) in constrained linear rearward and
                forward paths. Id. These bump-stock-type devices are generally designed
                to operate with the shooter shouldering the stock of the device (in
                essentially the same manner a shooter would use an unmodified
                semiautomatic shoulder stock), maintaining constant forward pressure
                with the non-trigger hand on the barrel-shroud or fore-grip of the
                rifle, and maintaining the trigger finger on the device's ledge with
                constant rearward pressure. Id. The device itself then harnesses the
                recoil energy of the firearm, providing the primary impetus for
                automatic fire. Id.
                 In light of its reassessment of the relevant statutory terms
                ``single function of the trigger'' and ``automatically,'' the NPRM
                stated ATF's conclusion that bump-stock-type devices are
                ``machineguns'' as defined in the NFA because they convert an otherwise
                semiautomatic firearm into a machinegun by functioning as a self-acting
                or self-regulating mechanism that, after a single pull of the trigger,
                harnesses the recoil energy of the semiautomatic firearm in a manner
                that allows the trigger to reset and continue firing without additional
                physical manipulation of the trigger by the shooter. Hence, a
                semiautomatic firearm to which a bump-stock-type device is attached is
                able to produce automatic fire with a single pull of the trigger.
                C. Proposed Definition of ``Single Function of the Trigger''
                 The Department proposed to interpret the phrase ``single function
                of the trigger'' to mean ``a single pull of the trigger,'' as it
                considered it the best interpretation of the statute and because it
                reflected ATF's position since 2006. The Supreme Court in Staples v.
                United States, 511 U.S. 600, 602 n.1 (1994), indicated that a
                machinegun within the NFA ``fires repeatedly with a single pull of the
                trigger.'' This interpretation is also consistent with how the phrase
                ``single function of the trigger'' was understood at the time of the
                NFA's enactment in 1934. For instance, in a congressional hearing
                leading up to the NFA's enactment, the National Rifle Association's
                then-president testified that a gun ``which is capable of firing more
                than one shot by a single pull of the trigger, a single function of the
                trigger, is properly regarded, in my opinion, as a machine gun.''
                National Firearms Act: Hearings Before the Committee on Ways and Means,
                H.R. 9066, 73rd Cong., 2nd Sess., at 40 (1934). Furthermore, and as
                noted above, the Eleventh Circuit in Akins concluded that ATF's
                interpretation of ``single function of the trigger'' to mean a ``single
                pull of the trigger'' ``is consonant with the statute and its
                legislative history.'' 312 F. App'x at 200. No other court has held
                otherwise.\5\
                ---------------------------------------------------------------------------
                 \5\ The NPRM also explained that the term ``pull'' can be
                analogized to ``push'' and other terms that describe activation of a
                trigger. For instance, ATF used the term ``pull'' in classifying the
                Akins Accelerator because that was the manner in which the firearm's
                trigger was activated with the device. But the courts have made
                clear that whether a trigger is operated through a ``pull,''
                ``push,'' or some other action such as a flipping a switch, does not
                change the analysis of the functionality of a firearm. For example,
                in United States v. Fleischli, 305 F.3d 643, 655-56 (7th Cir. 2002),
                the Seventh Circuit rejected the argument that a switch did not
                constitute a trigger for purposes of assessing whether a firearm was
                a machinegun under the NFA, because such an interpretation of the
                statute would lead to ``the absurd result of enabling persons to
                avoid the NFA simply by using weapons that employ a button or switch
                mechanism for firing.'' See also United States v. Camp, 343 F.3d
                743, 745 (5th Cir. 2003) (`` `To construe ``trigger'' to mean only a
                small lever moved by a finger would be to impute to Congress the
                intent to restrict the term to apply only to one kind of trigger,
                albeit a very common kind. The language [in 18 U.S.C. 922(o)]
                implies no intent to so restrict the meaning[.]' '' (quoting United
                States v. Jokel, 969 F.2d 132, 135 (5th Cir. 1992) (emphasis
                removed))). Examples of machineguns that operate through a trigger
                activated by a push include the Browning design, M2 .50 caliber, the
                Vickers, the Maxim, and the M134 hand-fired Minigun.
                ---------------------------------------------------------------------------
                [[Page 66519]]
                D. Proposed Definition of ``Automatically''
                 The Department also proposed to interpret the term
                ``automatically'' to mean ``as the result of a self-acting or self-
                regulating mechanism that allows the firing of multiple rounds through
                a single pull of the trigger.'' That interpretation reflects the
                ordinary meaning of that term at the time of the NFA's enactment in
                1934. The word ``automatically'' is the adverbial form of
                ``automatic,'' meaning ``[h]aving a self-acting or self-regulating
                mechanism that performs a required act at a predetermined point in an
                operation[.]'' Webster's New International Dictionary 187 (2d ed.
                1934); see also 1 Oxford English Dictionary 574 (1933) (defining
                ``Automatic'' as ``[s]elf-acting under conditions fixed for it, going
                of itself.'').
                 Relying on these definitions, the United States Court of Appeals
                for the Seventh Circuit interpreted the term ``automatically'' as used
                in the NFA as ``delineat[ing] how the discharge of multiple rounds from
                a weapon occurs: As the result of a self-acting mechanism . . . set in
                motion by a single function of the trigger and . . . accomplished
                without manual reloading.'' United States v. Olofson, 563 F.3d 652, 658
                (7th Cir. 2009). So long as the firearm is capable of producing
                multiple rounds with a single pull of the trigger until the trigger
                finger is removed, the ammunition supply is exhausted, or the firearm
                malfunctions, the firearm shoots ``automatically'' irrespective of why
                the firing sequence ultimately ends. Id. (``[T]he reason a weapon
                ceased firing is not a matter with which Sec. 5845(b) is
                concerned.''). Olofson thus requires only that the weapon shoot
                multiple rounds with a single function of the trigger ``as the result
                of a self-acting mechanism,'' not that the self-acting mechanism
                produces the firing sequence without any additional action by the
                shooter. This definition accordingly requires that the self-acting or
                self-regulating mechanism allows the firing of multiple rounds through
                a single function of the trigger.
                E. Proposed Clarification That the Definition of ``Machinegun''
                Includes Bump-Stock-Type Devices
                 The Department also proposed, based on the interpretations
                discussed above, to clarify that the term ``machinegun'' includes a
                device that allows a semiautomatic firearm to shoot more than one shot
                with a single pull of the trigger by harnessing the recoil energy of
                the semiautomatic firearm to which it is affixed so that the trigger
                resets and continues firing without additional physical manipulation of
                the trigger by the shooter. The Department explained that when a
                shooter who has affixed a bump-stock-type device to a semiautomatic
                firearm pulls the trigger, that movement initiates a firing sequence
                that produces more than one shot. And that firing sequence is
                ``automatic'' because the device harnesses the firearm's recoil energy
                in a continuous back-and-forth cycle that allows the shooter to attain
                continuous firing after a single pull of the trigger, so long as the
                trigger finger remains stationary on the device's ledge (as designed).
                Accordingly, these devices are included under the definition of
                ``machinegun'' and, therefore, come within the purview of the NFA.
                F. Amendment of 27 CFR 479.11
                 The regulatory definition of ``machine gun'' in 27 CFR 479.11
                matches the statutory definition of ``machinegun'' in the NFA. The
                definition includes the terms ``single function of the trigger'' and
                ``automatically,'' but those terms are not defined in the statutory
                text. The NPRM proposed to define these terms in order to clarify the
                meaning of ``machinegun.'' Specifically, the Department proposed to
                amend the definition of ``machine gun'' in 27 CFR 479.11 by:
                 1. Defining the term ``single function of the trigger'' to mean
                ``single pull of the trigger'';
                 2. defining the term ``automatically'' to mean ``as the result of a
                self-acting or self-regulating mechanism that allows the firing of
                multiple rounds through a single pull of the trigger''; and
                 3. adding a sentence to clarify that a ``machine gun'' includes a
                device that allows a semiautomatic firearm to shoot more than one shot
                with a single pull of the trigger by harnessing the recoil energy of
                the semiautomatic firearm to which it is affixed so that the trigger
                resets and continues firing without additional physical manipulation of
                the trigger by the shooter (commonly known as a bump-stock-type
                device).
                G. Amendment of 27 CFR 478.11
                 The GCA and its implementing regulations in 27 CFR part 478
                reference the NFA's definition of machinegun. Accordingly, the NPRM
                proposed to make the same amendments in 27 CFR 478.11 that were
                proposed for Sec. 479.11.
                H. Amendment of 27 CFR 447.11
                 The Arms Export Control Act (AECA), as amended, does not define the
                term ``machinegun'' in its key provision, 22 U.S.C. 2778.\6\ However,
                regulations in 27 CFR part 447 that implement the AECA include a
                similar definition of ``machinegun,'' and explain that machineguns,
                submachineguns, machine pistols, and fully automatic rifles fall within
                Category I(b) of the U.S. Munitions Import List when those defense
                articles are permanently imported. See 27 CFR 447.11, 447.21.
                Currently, the definition of ``machinegun'' in Sec. 447.11 provides
                that ``[a] `machinegun', `machine pistol', `submachinegun', or
                `automatic rifle' is a firearm originally designed to fire, or capable
                of being fired fully automatically by a single pull of the trigger.''
                The NPRM proposed to harmonize the AECA's regulatory definition of
                machinegun with the definitions in 27 CFR parts 478 and 479, as those
                definitions would be amended by the proposed rule.
                ---------------------------------------------------------------------------
                 \6\ Under the AECA, the President has the authority to designate
                which items are controlled as defense articles for purposes of
                importation and exportation. 22 U.S.C. 2778(a)(1). The President
                has, in turn, delegated to the Attorney General the authority to
                promulgate regulations designating the defense articles controlled
                for permanent importation, including machineguns.
                ---------------------------------------------------------------------------
                IV. Analysis of Comments and Department Responses for Proposed Rule
                 In response to the NPRM, ATF received over 186,000 comments.
                Submissions came from individuals, including foreign nationals,
                lawyers, and government officials, as well as various interest groups.
                Overall, 119,264 comments expressed support for the proposed rule,
                66,182 comments expressed opposition, and for 657 comments, the
                commenter's position could not be determined. The commenters' grounds
                for support and opposition, along with specific concerns and
                suggestions, are discussed below.
                A. Comments Generally Supporting the Rule
                Comments Received
                 Of the 119,264 comments received in support of the rule, 14,618
                used one form letter in support of the proposed rule; 51,454 were
                petitions or petition signatures compiled by an organization and
                individuals; and 53,192 were unique comments. Many of the 53,192 unique
                comments used repetitious declarations of support or a single sentence
                or phrase, declaring, in essence, (1) ban bump stocks now or I
                [[Page 66520]]
                support a ban; (2) common sense gun reform or gun control now; (3) bump
                stocks should be outlawed; or (4) I fully support this proposed rule.
                Others supporting the rule expressed disbelief as to how such devices
                were legal and that it seemed to be a ``no brainer,'' especially after
                Las Vegas, to prevent anyone from possessing an item that allows the
                shooter to inflict mass carnage. Several commenters stated that they
                were present at or knew people who were directly affected by the Las
                Vegas shooting and urged finalization of the proposed rule on bump-
                stock-type devices. Some commenters identified as active or former
                military, while other individuals noted their support for a prohibition
                on bump-stock-type devices while identifying as gun owners and gun
                enthusiasts, strong supporters of the Second Amendment, or members of a
                particular pro-gun interest group. For instance, one commenter wrote,
                ``As an FFL [Federal firearms license] dealer, gun owner and collector,
                I am writing to support the ban on the sale of bump stocks.'' Another
                explained that he has been a member of the National Rifle Association
                (NRA) for over 30 years and loves hunting and shooting but believes
                ``there is zero justification for bump stocks,'' because the ``only
                thing bump stocks are good for is creating a kill zone.''
                Department Response
                 The Department acknowledges the commenters' support for the
                proposed rule. The rule clarifies the regulatory definition of
                ``machinegun'' to include bump-stock-type devices, and, therefore,
                subjects them to the restrictions imposed by the NFA and GCA. As 18
                U.S.C. 922(o), with limited exceptions, prohibits the possession of
                machineguns that were not lawfully possessed before the effective date
                of the statute, current possessors of bump-stock-type devices will be
                obligated to cease possessing these devices.
                B. Particular Reasons Raised in Support of the Rule
                1. Threat to Public Safety
                Comments Received
                 Over 36,000 of the supporting comments expressly cited public
                safety, saving lives (or specifically children's lives), reducing gun
                deaths and future mass shootings, or protecting law enforcement as the
                reason for supporting a rule that would restrict possession of bump-
                stock-type devices. A majority of these comments, including submissions
                from professional medical associations, declared that allowing persons
                to modify semiautomatic rifles with bump-stock-type devices so that
                they operate with a similar rate of fire as fully automatic rifles
                poses a substantial risk to public safety and that the continued
                presence of these devices puts all communities at risk. Some commenters
                said that research shows that nations that have reasonable gun
                restrictions experience fewer mass shootings. Additionally, many
                students and numerous individuals identified as former or current
                teachers expressed support for the rule, with some citing fear that
                their school could be the next site of a mass shooting or stating that
                they do not want to continue seeing their students in constant fear of
                the next active shooter.
                 Several commenters also noted that bump-stock-type devices are a
                danger to police forces, with one commenter, a retired law enforcement
                officer, declaring that regulating bump-stock-type devices is an issue
                of public safety and will save the lives of those who are in law
                enforcement. Similarly, other commenters, including a former military
                physician, stated that the rapid fire enabled by bump-stock-type
                devices significantly increases the casualties in an attack and puts
                police officers who respond at greater risk. In light of the Las Vegas
                shooting, many commenters argued that, given that bump-stock-type
                devices are easily attainable and inexpensive items, prohibiting these
                devices is a needed step to reduce gun deaths or prevent future mass
                shootings. Many individuals, including several State and local
                government officials and gun safety or public health groups, expressed
                the urgent need for ATF to finalize the proposed rule in order to
                protect the public and children, especially given the frequency of mass
                shootings in recent months and the likelihood that a potential
                perpetrator will seek out these devices.
                Department Response
                 The Department acknowledges that a bump-stock-type device combined
                with a semiautomatic firearm can empower a single individual to take
                many lives in a single incident. The reason for the Department's
                classification change is that ATF, upon review (discussed in Part III),
                believes that bump-stock-type devices must be regulated because they
                satisfy the statutory definition of ``machinegun'' in the NFA and GCA.
                By making clear that these devices are subject to the restrictions that
                the NFA and GCA place on machineguns, this rule reflects the public
                safety goals of those statutes. Indeed, the NPRM stated that the Las
                Vegas tragedy made ``individuals aware that these devices exist--
                potentially including persons with criminal or terrorist intentions--
                and made their potential to threaten public safety obvious.'' 83 FR at
                13447. For further discussion of benefits, see Part VI.A.
                2. Unnecessary for Civilians to Own
                Comments Received
                 Of the total supporting comments, at least 25,135 of the commenters
                opined that bump-stock-type devices have no place in civil society and
                are unnecessary for ordinary persons to own. One of the primary reasons
                thousands expressed support for the regulation was their view that
                bump-stock-type devices have no legitimate uses for hunting or sporting
                purposes, target shooting, or self-protection. Many of these commenters
                emphasized that the devices cause a decrease in shooter accuracy, and
                therefore are not useful for hunting and target shooting, and are
                inappropriate for use in self or home defense. For example, one
                commenter rhetorically stated, ``[W]hat law abiding gun owner who is
                responsible for every bullet they shoot would want to reduce their
                accuracy?'' Some of these commenters further asserted that because the
                devices enable rapid but inaccurate fire, they pose a particular risk
                to large-scale public events, such as the Las Vegas concert. Many
                commenters, including those identifying as former or active military
                members, commented that only the military or law enforcement should
                have access to bump-stock-type devices or that there was no need for
                civilians to have access to them.
                Department Response
                 The Department acknowledges supporters' comments on limiting the
                possession of bump-stock-type devices to military or law enforcement.
                Such a limitation is consistent with the Firearms Owners' Protection
                Act (FOPA), Public Law 99-308, 100 Stat. 449, which makes it unlawful
                for any person to transfer or possess a machinegun that was not
                lawfully possessed before the effective date of the statute. FOPA made
                an exception for governmental entities, allowing for the ``transfer to
                or by, or possession by or under the authority of, the United States or
                any department or agency thereof or a State, or a department, agency,
                or political subdivision thereof.'' 18 U.S.C. 922(o)(2)(A). Congress
                provided this exemption because it recognized the necessity for the
                military and law enforcement to continue to use and possess these types
                of weapons. This final rule is consistent with
                [[Page 66521]]
                implementing the requirements of the NFA and GCA provisions that
                regulate possession of machineguns.
                3. Consistent With the Intent of the National Firearms Act
                Comments Received
                 More than 27,000 of the supporting comments urged issuance of the
                final rule because bump-stock-type devices and other similar conversion
                devices were meant to circumvent the restrictions of the NFA and GCA,
                as bump-stock-type devices enable shooters to transform their guns into
                automatic weapons. Some commenters asserted that it is useless to have
                a law against automatic weapons yet allow manufacturers to legally
                produce and sell an item with the sole purpose of turning a firearm
                into an automatic weapon. Many of these commenters also stated that
                bump-stock-type devices violate the spirit of the law and that this
                loophole should be closed by ATF as quickly as possible. Further, at
                least 1,675 of the supporting comments stated that the proposed rule is
                consistent with the purposes of the NFA and the intent of Congress.
                Specifically, these commenters opined that the regulation ``enforces
                machinegun laws that date back many decades'' and that ``it will have
                the same dramatic benefit originally intended by those foundational
                laws.''
                Department Response
                 The Department acknowledges supporters' comments that bump-stock-
                type devices were meant to circumvent the restrictions of the NFA and
                GCA. Prior to this rule, ATF issued classification letters that
                determined that some bump-stock-type devices were not ``machineguns''
                as defined by the NFA. Those decisions, however, did not include
                extensive legal analysis, as described in Part III. Upon reexamining
                these classifications, this final rule promulgates definitions for the
                terms ``single function of the trigger'' and ``automatically'' as those
                terms are used in the statutory definition of ``machinegun.'' ATF
                believes these definitions represent the best interpretation of the
                statute. Therefore, recognizing that a bump-stock-type device used with
                a semiautomatic firearm enables a shooter to shoot automatically more
                than one shot by a single function of the trigger, the purpose of this
                rule is to clarify that such devices are machineguns under the NFA.
                4. Constitutional Under the Second Amendment
                Comments Received
                 More than 2,100 commenters in support of the rule argued that a
                rule prohibiting possession of bump-stock-type devices does not
                conflict with the Second Amendment. Many opined that the Framers of the
                Constitution did not intend for these types of devices, which can
                inflict mass carnage, to be protected by the Second Amendment.
                Commenters expressed the view that because persons living in the 18th
                century used muskets capable of firing only one shot before requiring a
                long reloading process, our forefathers would not have wanted bump-
                stock-type devices to be readily available. Other commenters, including
                those who declared themselves to be strong supporters of the Second
                Amendment, stated that prohibiting bump-stock-type devices was
                consistent with the Second Amendment.
                 Several commenters noted language from the majority opinion in
                District of Columbia v. Heller, 554 U.S. 570 (2008). There, the Supreme
                Court declared that the Second Amendment protects an individual right
                to bear arms for traditional lawful purposes such as self-defense and
                hunting. However, the Court also stated, ``Like most rights, the right
                secured by the Second Amendment is not unlimited. From Blackstone
                through the 19th-century cases, commentators and courts routinely
                explained that the right was not a right to keep and carry any weapon
                whatsoever in any manner whatsoever and for whatever purpose.'' Id. at
                626. Commenters further summarized the Court's conclusions that
                limitations on the right to keep and carry arms are supported by the
                historical tradition of prohibiting the carrying of ``dangerous and
                unusual weapons.'' Id. at 627. Commenters argued that the Supreme
                Court's Second Amendment decisions support the proposed rule.
                Department Response
                 The Department acknowledges supporters' concerns and agrees that
                regulation of bump-stock-type devices is permissible under the Second
                Amendment. For discussion of the Department's position on the
                constitutionality of this final rule under the Second Amendment, see
                Part IV.D.1.a.
                5. Absence of Congressional Action
                Comments Received
                 Over 1,500 comments in support urged action on this final rule by
                invoking popular support for responsible gun limitations. Many of these
                commenters stated this measure would be a sensible first step for gun
                safety and that ATF should act where Congress has not acted. One gun
                safety organization noted that while congressional measures have
                stalled, ATF is doing what it can to refine rules. At least 1,300
                commenters indicated that ATF should choose saving children and the
                public welfare over the interests of the gun industry and pro-gun
                organizations, naming in particular the NRA. One commenter wrote,
                ``It's time we quit cow-towing [sic] to the NRA and considered all the
                rest of us and our children especially. Being afraid to go to school is
                unAmerican which is what the insistence by the NRA on no gun control
                is--unAmerican.'' Many supporting commenters echoed these sentiments.
                Department Response
                 In light of the legal analysis of the term ``machinegun'' set forth
                above, the Department agrees with commenters that it is necessary to
                clarify that the term ``machinegun'' includes bump-stock-type devices.
                Congress granted the Attorney General authority to issue rules to
                administer the NFA and GCA, and the Attorney General has delegated to
                ATF the authority to administer and enforce these statutes and to
                implement the related regulations accordingly. The Department and ATF
                have initiated this rulemaking to clarify the regulatory interpretation
                of the NFA and GCA.
                C. Comments Generally Opposing the Rule
                Comments Received
                 A total of 66,182 comments were received that opposed the rule.
                Approximately 40,806 of those comments were form submissions by the
                National Association for Gun Rights (NAGR) on behalf of its members,
                with 25,874 submitted on paper petitions and 14,932 submitted by
                facsimile. The remaining 25,376 opposing comments were individually
                submitted. Many of the commenters identified as lawyers, judges,
                industry groups, or members of law enforcement or the military. There
                were several commenters who stated they did not own or had no interest
                in owning a bump-stock-type device but still objected to the rule on
                various grounds, including that it is unconstitutional and only
                punishes law-abiding owners of bump-stock-type devices. Of the 25,376
                comments individually submitted, 12,636 used one of three form letters;
                the remaining 12,740 were unique comments. A majority of these
                commenters raised
                [[Page 66522]]
                specific, detailed objections to the agency's proposal and the premise
                upon which the regulation is based, whereas several hundred of the
                unique comments were limited to a few sentences opposing the regulation
                without further detail. For example, these types of comments simply
                declared, in essence, (1) no ban, or a ban is unnecessary; (2)
                individuals' Second Amendment rights should not be infringed; or (3) I
                oppose any additional gun regulations.
                Department Response
                 The Department acknowledges the commenters' objections to the
                proposed rule but disagrees with assertions that the rule infringes on
                the constitutional right to keep and bear arms and punishes law-abiding
                gun owners. The Department believes that bump-stock-type devices
                satisfy the definition of ``machinegun'' under the NFA and GCA and that
                this final rule reflects the public safety goals of the NFA and GCA.
                The Department thoroughly considered the various issues raised in
                opposition to the rule, which are discussed below.
                D. Specific Issues Raised in Opposition to the Rule
                1. Constitutional and Statutory Arguments
                a. Violates the Second Amendment
                Comments Received
                 A total of 16,051 of the commenters opposed the rule on the ground
                that it violates the Second Amendment. Of these, 11,753 used a form
                letter stating that the ``regulations dismiss Second Amendment
                protections, by appealing to the Heller court decision. But the
                Constitution trumps the Supreme Court--so when the Second Amendment
                says the right to keep and bear arms shall not be infringed, any
                limitation of the right for law-abiding citizens should be treated as
                unconstitutional[.]'' Many commenters, including those identifying as
                former or active law enforcement or military members, echoed these
                sentiments by declaring that the proposed rule infringes on the rights
                of law-abiding gun owners, and that the phrasing of the Second
                Amendment--``shall not be infringed''--strictly limits or negates the
                ability of Government to impose any regulations on firearms. One
                commenter, for instance, argued that the Second Amendment's reference
                to a ``well-regulated Militia'' includes unorganized militia, which the
                commenter interpreted to mean any person who owns a gun. Because the
                military has automatic weapons, the commenter reasoned that the
                people--as the unorganized militia--are likewise constitutionally
                entitled to access such weapons.
                 Numerous commenters cited the Supreme Court's decision in Heller,
                554 U.S. 570, which declared that the Second Amendment protects an
                individual right to bear arms. Commenters also referred to the Supreme
                Court's decision in Caetano v. Massachusetts, 136 S. Ct. 1027 (2016)
                (per curiam), stating that this decision makes clear that weapons in
                ``common use'' cannot be banned. One commenter pointed out that if
                bump-stock-type devices are now machineguns, then there are an
                additional 519,927 machineguns that are currently owned typically by
                law-abiding citizens for lawful purposes. This amount, the commenter
                argued, surpasses the 200,000 stun guns found to trigger a ``common
                use'' analysis in Caetano, meaning that such items cannot be banned
                unless they are both dangerous and unusual. Further, commenters said
                that Caetano stands for the proposition that any advancement in
                weaponry is still protected under the Second Amendment. They argued
                that the Court declared ``the Second Amendment extends, prima facie, to
                all instruments that constitute bearable arms, even those that were not
                in existence at the time of the founding'' and that its protection is
                not limited to only those weapons useful in warfare. Id. at 1027
                (internal quotation marks omitted).
                Department Response
                 The Department does not believe that the proposed regulation
                violates the Second Amendment. The Supreme Court has indicated, and
                several lower courts have squarely held, that the Second Amendment does
                not protect a right to possess a machinegun. Because bump-stock-type
                devices are machinegun conversion devices that qualify as
                ``machineguns'' under Federal law, see supra Part III.E., prohibiting
                them does not violate the Second Amendment.
                 ``Like most rights, the right secured by the Second Amendment is
                not unlimited.'' Heller, 554 U.S. at 626; accord McDonald v. City of
                Chi., 561 U.S. 742, 786 (2010). In Heller, for example, the Supreme
                Court recognized an ``important limitation on the right to keep and
                carry arms'': ``the historical tradition of prohibiting the carrying of
                `dangerous and unusual weapons.' '' 554 U.S. at 627. More specifically,
                and importantly for purposes of this rulemaking, the Court explicitly
                described machineguns as the kind of dangerous and unusual weapons not
                protected by the Second Amendment. In the course of explaining the
                Court's holding in United States v. Miller, 307 U.S. 174 (1939)
                (upholding Federal prohibition of short-barreled shotguns), the Court
                noted that a portion of Miller could be ``[r]ead in isolation'' to
                ``mean that only those weapons useful in warfare are protected'' by the
                Second Amendment. Heller, 554 U.S. at 624. But ``[t]hat would be a
                startling reading of the opinion,'' the Court continued, ``since it
                would mean that the National Firearms Act's restrictions on machineguns
                . . . might be unconstitutional, machineguns being useful in warfare in
                1939.'' Id. Heller thus made clear that machineguns, like short-
                barreled shotguns, are ``weapons not typically possessed by law-abiding
                citizens for lawful purposes,'' and thus fall outside the scope of the
                Second Amendment as historically understood. Id. at 625; see also id.
                at 627 (accepting that M-16 rifles are dangerous and unusual weapons
                that may be banned).
                 In the decade since Heller was decided, lower courts have
                consistently upheld prohibitions of machineguns. Hollis v. Lynch, 827
                F.3d 436, 451 (5th Cir. 2016) (upholding Federal statute banning
                possession of machineguns because they are ``dangerous and unusual and
                therefore not in common use''); United States v. Henry, 688 F.3d 637,
                640 (9th Cir. 2012); Hamblen v. United States, 591 F.3d 471, 472, 474
                (6th Cir. 2009); United States v. Fincher, 538 F.3d 868, 874 (8th Cir.
                2008); see also Heller v. Dist. of Columbia (Heller II), 670 F.3d 1244,
                1270 (D.C. Cir. 2011) (Kavanaugh, J., dissenting) (``fully automatic
                weapons, also known as machine guns, have traditionally been banned and
                may continue to be banned after Heller''); United States v.
                Marzzarella, 614 F.3d 85, 94-95 (3d Cir. 2010) (``the Supreme Court has
                made clear the Second Amendment does not protect'' machineguns and
                short-barreled shotguns).
                 This body of precedent, in addition to Heller, strongly supports
                the Department's view that a bump-stock-type device, as a machinegun
                conversion device qualifying as a ``machinegun'' under Federal law, is
                not protected by the Second Amendment. What makes a machinegun a
                ``dangerous and unusual weapon'' unprotected by the Second Amendment is
                its capacity to fire automatically, see, e.g., Henry, 688 F.3d at 640,
                which ``puts the machine gun on a different plane'' than other
                firearms, United States v. Kirk, 105 F.3d 997, 1002 (5th Cir. 1997) (en
                banc) (opinion of Higginbotham, J.). Bump-stock-type devices qualify as
                machineguns, as discussed above,
                [[Page 66523]]
                because they enable an otherwise semiautomatic firearm to fire
                automatically. Since they bear the same key characteristic that makes
                traditional machineguns ``dangerous and unusual,'' bump-stock-type
                devices are unprotected by the Second Amendment for the same reason.
                 This conclusion is fully consistent with Caetano v. Massachusetts,
                136 S. Ct. 1027. In Caetano, the Supreme Judicial Court of
                Massachusetts had upheld a State prohibition of stun guns on the
                grounds that stun guns were not in common use when the Second Amendment
                was ratified and are not useful in military operations. See id. at
                1027-28. The Supreme Court summarily vacated this ruling because
                neither of the State court's premises was valid: Heller made a ``clear
                statement that the Second Amendment `extends . . . to . . . arms . . .
                that were not in existence at the time of the founding,' '' and
                ``rejected the proposition `that only those weapons useful in warfare
                are protected.' '' Id. at 1028 (quoting Heller, 554 U.S. at 582, 624-
                25). The Department's conclusion in this rulemaking that the Second
                Amendment does not protect bump-stock-type devices rests on neither of
                the propositions rejected by Caetano. As discussed above, the
                Department believes that this rule comports with the Second Amendment
                because bump-stock-type devices qualify as machineguns, which are not
                constitutionally protected--not because bump-stock-type devices did not
                exist in 1791 or are not useful in warfare. Moreover, although the
                Supreme Judicial Court of Massachusetts ultimately held that stun guns
                are protected under the Second Amendment in Ramirez v. Commonwealth, 94
                NE3d 809 (2018), the court did not suggest that more dangerous weapons,
                like machineguns and machinegun conversion devices, are also protected.
                The court acknowledged that a stun gun is even ``less lethal than a
                handgun,'' id. at 817, the weapon that the Supreme Court expressly held
                to be protected in Heller, 554 U.S. at 635.
                b. Violates the Fifth Amendment
                i. Violates Due Process Clause--Entrapment
                Comments Received
                 At least one commenter, a gun-rights nonprofit organization, argued
                that ATF's change of position constitutes unconstitutional entrapment.
                It maintained that ATF's past classification letters, which informed
                the public that certain bump-stock-type devices were not subject to the
                NFA or GCA, invited the public to rely on its consistent decisions and
                acquire such items. With the sudden change of position, the
                organization asserted, ATF seeks to entrap citizens who have simply
                purchased a federally approved firearm accessory. Citing Sherman v.
                United States, 356 U.S. 367, 376 (1958), the organization argued that
                it is ``unconstitutional for the Government to beguile an individual
                `into committing crimes which he otherwise would not have attempted.'
                '' Further, it argued that at least some 520,000 law-abiding citizens
                could be criminals who could face up to ten years' imprisonment
                ``without even receiving individual notice of ATF's reversal of
                position.''
                Department Response
                 The Department disagrees that the final rule amounts to entrapment.
                Entrapment is a complete defense to a criminal charge on the theory
                that ``Government agents may not originate a criminal design, implant
                in an innocent person's mind the disposition to commit a criminal act,
                and then induce commission of the crime so that the Government may
                prosecute.'' Jacobson v. United States, 503 U.S. 540, 548 (1992). A
                valid entrapment defense has two related elements: (1) Government
                inducement of the crime, and (2) the defendant's lack of predisposition
                to engage in the criminal conduct. Mathews v. United States, 485 U.S.
                58, 63 (1988).
                 As described above, ATF has now concluded that it misclassified
                some bump-stock-type devices and therefore initiated this rulemaking
                pursuant to the requirements of the APA. An agency is entitled to
                correct its mistakes. See Williams Gas Processing-Gulf Coast Co. v.
                FERC, 475 F.3d 319, 326 (D.C. Cir. 2006) (``[I]t is well understood
                that [a]n agency is free to discard precedents or practices it no
                longer believes correct. Indeed we expect that an [ ] agency may well
                change its past practices with advances in knowledge in its given field
                or as its relevant experience and expertise expands. If an agency
                decides to change course, however, we require it to supply a reasoned
                analysis indicating that prior policies and standards are being
                deliberately changed, not casually ignored.''). This rulemaking
                procedure is specifically designed to notify the public about changes
                in ATF's interpretation of the NFA and GCA and to help the public avoid
                the unlawful possession of a machinegun. It is important to note that
                at no time did ATF induce any member of the public to commit a crime.
                The ANPRM, NPRM, and this final rule have followed the statutory
                process for ensuring that the public is aware of the correct
                classification of bump-stock-type devices under the law, and that
                continued possession of such devices is prohibited. Anyone currently in
                possession of a bump-stock-type device is not acting unlawfully unless
                they fail to relinquish or destroy their device after the effective
                date of this regulation.
                ii. Violates Takings Clause and Due Process Clause
                Comments Received
                 Over 1,200 commenters objected that the rule will violate the
                Takings Clause of the Fifth Amendment, which provides ``private
                property [shall not] be taken for public use, without just
                compensation.'' Some commenters said that the Takings Clause requires
                the Government to compensate manufacturers for their present and future
                loss of revenues. Many other commenters further indicated that the
                Government would owe compensation to owners of bump-stock-type devices
                because the Government would effectively be taking personal property
                for public safety, which is a form of public use. They cited Horne v.
                Department of Agriculture, 135 S. Ct. 2419, 2428 (2015), for the
                proposition that mandating relinquishment of property constitutes a
                physical taking and requires compensation. One commenter contrasted
                this rule with the regulation at issue in Andrus v. Allard, 444 U.S. 51
                (1979), which prohibited the commercial sale of eagle body parts
                gathered before 1940. The commenter observed that the Supreme Court
                held the eagle-part regulation was not a regulatory taking because it
                did not compel the surrender of the body parts and imposed no physical
                invasion or restraint upon them. Id. at 65-66. By contrast, the
                commenter noted, owners of bump-stock-type devices under the regulation
                would be compelled to surrender their devices or face criminal
                penalties.
                 Several commenters also stated that ``for this regulation to be
                Constitutional each and every owner of a bump stock, or other devices
                captured in this regulation not yet named, must be given their day in
                court to present evidence and an argument as to why their property
                shouldn't be taken without compensation at a minimum.''
                 Many commenters separately opined that the Department did not
                include the cost of compensation in its cost-benefit analysis and
                several proposed estimated costs of such compensation. Those comments
                are addressed in Part IV.I.1.
                [[Page 66524]]
                Department Response
                 The Department does not agree that classifying bump-stock-type
                devices as machineguns results in the unlawful taking of property ``for
                public use, without just compensation.'' U.S. Const. amend. V. It is
                well established that ``the nature of the [government's] action is
                critical in takings analysis.'' Keystone Bituminous Coal Ass'n v.
                DeBenedictis, 480 U.S. 470, 488 (1987); accord Penn Cent. Transp. Co.
                v. City of New York, 438 U.S. 104, 124 (1978) (``character of the
                government action'' has ``particular significance''). The Department's
                action here, classifying bump-stock-type devices as machineguns subject
                to the NFA and GCA, does not have the nature of a taking.
                 A restriction on ``contraband or noxious goods'' and dangerous
                articles by the government to protect public safety and welfare ``has
                not been regarded as a taking for public use for which compensation
                must be paid.'' Acadia Tech., Inc. v. United States, 458 F.3d 1327,
                1332 (Fed. Cir. 2006); see also United States v. $7,990.00 in U.S.
                Currency, 170 F.3d 843, 845 (8th Cir. 1999) (``forfeiture of contraband
                is an exercise of the government's police power'' and does not qualify
                as a taking).\7\ The Takings Clause was ``not intended as a limitation
                of the exercise of those police powers which are necessary to the
                tranquility of every well-ordered community, nor of that general power
                over private property which is necessary for the orderly existence of
                all governments. It has always been held that the legislature may make
                police regulations, although they may interfere with the full enjoyment
                of private property, and though no compensation is given.'' Chi.,
                Burlington & Quincy Ry. Co. v. Illinois, 200 U.S. 561, 594 (1906)
                (internal quotation marks omitted); see, e.g., Holliday Amusement Co.
                of Charleston v. South Carolina, 493 F.3d 404, 409-11 (4th Cir. 2007)
                (upholding State prohibition of video gaming machines without
                compensation).
                ---------------------------------------------------------------------------
                 \7\ In the takings context, the use of the term ``police power''
                in connection with Federal regulation does not posit the existence
                of a ``plenary police power'' at the Federal level. Cf. United
                States v. Lopez, 514 U.S. 549, 566 (1995). Rather, it refers to
                ``the power of the federal government to engage,'' pursuant to one
                or more of its enumerated powers, ``in activities not unlike those
                engaged in by the states under their inherent sovereign powers'' to
                protect the public welfare. Fla. Rock Indus., Inc. v. United States,
                18 F.3d 1560, 1568 n.17 (Fed. Cir. 1994).
                ---------------------------------------------------------------------------
                 In Mugler v. Kansas, 123 U.S. 623, 668-69 (1887), for example, the
                Supreme Court rejected a distiller's argument that a State
                constitutional amendment prohibiting the manufacture and sale of
                intoxicating liquors was an unconstitutional taking. The Court
                explained that the government's power to prohibit the ``use by
                individuals of their property, as will be prejudicial to the health,
                the morals, or the safety of the public, is not, and, consistently with
                the existence and safety of organized society, cannot be, burdened with
                the condition that the state must compensate such individual owners for
                pecuniary losses they may sustain, by reason of their not being
                permitted, by a noxious use of their property, to inflict injury upon
                the community.'' Id. at 669. Similarly, the Supreme Court held in
                Miller v. Schoene, 276 U.S. 272, 280 (1928), that Virginia was not
                required to compensate owners of red cedar trees for the value of trees
                that the State had ordered destroyed to prevent the spread of a disease
                that threatened local apple orchards. ``[W]here the public interest is
                involved,'' the Court observed, ``preferment of that interest over the
                property interest of the individual, to the extent even of its
                destruction, is one of the distinguishing characteristics of every
                exercise of the police power which affects property.'' Id. at 279-80.
                Lower courts have likewise deemed the Takings Clause inapplicable to
                governmental regulation of dangerous personal property for public-
                safety reasons. See, e.g., Garcia v. Vill. of Tijeras, 767 P.2d 355
                (N.M. Ct. App. 1988) (village ordinance banning possession of pit bulls
                was ``a proper exercise of the Village's police power'' and not a
                taking).
                 Consistent with these cases, courts have rejected arguments that
                restrictions on the possession of dangerous firearms, like machineguns,
                are takings requiring just compensation. In Akins v. United States, 82
                Fed. Cl. 619 (2008), for example, the Court of Federal Claims held that
                ATF's ultimate classification of the Akins Accelerator as a machinegun,
                see supra Part III, was not a taking. The court reasoned that ATF had
                acted ``pursuant to the police power conferred on it by Congress''
                rather than by exercising eminent domain, and that the plaintiff lacked
                a sufficient property interest because he had ``voluntarily entered an
                area subject to pervasive federal regulation--the manufacture and sale
                of firearms.'' Id. at 623-24; see also Bennis v. Michigan, 516 U.S.
                442, 452 (1996) (``The government may not be required to compensate an
                owner for property which it has already lawfully acquired under the
                exercise of governmental authority other than the power of eminent
                domain.''). Similar reasoning led the District of Columbia Court of
                Appeals to hold that a DC law prohibiting machineguns and requiring
                their disposal or removal was not a taking. Fesjian v. Jefferson, 399
                A.2d 861, 865-66 (1979). These precedents support the Department's
                conclusion that the prohibition of bump-stock-type devices as
                machineguns does not have the character of a compensable taking within
                the meaning of the Fifth Amendment.
                 The Department acknowledges that a panel of the U.S. Court of
                Appeals for the Ninth Circuit recently upheld a preliminary injunction
                against the Attorney General of California that relied in part on the
                Takings Clause in prohibiting the State from implementing restrictions
                on firearm magazines that hold more than 10 rounds. Duncan v. Becerra,
                No. 17-56081, 2018 WL 3433828 (9th Cir. July 17, 2018). The Ninth
                Circuit's order essentially adopted the district court's analysis of
                the Takings Clause question. See id. at *3. The district court's
                reasoning on the takings question was closely intertwined with the
                Second Amendment inquiry, and rested on the conclusion that it was
                ``dubious'' for California to deem large-capacity magazines a public
                nuisance given the Supreme Court's observation that ``[g]uns in general
                are not deleterious devices or products or obnoxious waste materials.''
                Duncan v. Becerra, 265 F. Supp. 3d 1106, 1137 (S.D. Cal. 2017)
                (internal quotation marks omitted) (quoting Staples v. United States,
                511 U.S. 600, 610 (1994)). But regulation of bump-stock-type devices is
                fundamentally distinguishable from California's prohibition on
                possessing such magazines. As discussed, and as Heller indicates,
                dangerous and unusual weapons are not entitled to Second Amendment
                protection, and may indeed qualify as deleterious devices or
                contraband. Other district courts have followed the reasoning of cases
                like Akins and Fesjian and rejected takings challenges to California
                firearm restrictions. See Rupp v. Becerra, 2018 WL 2138452, at *8-9
                (C.D. Cal. May 9, 2018) (restrictions on ``assault weapons''); Wiese v.
                Becerra, 263 F. Supp. 3d 986, 995 (E.D. Cal. 2017) (prohibition of
                large-capacity gun magazines).
                 Finally, the Department does not agree that each owner of a bump-
                stock-type device has a due-process right to a hearing in connection
                with the promulgation of this rule. The rule clarifies the scope of the
                NFA and GCA, general legislative enactments, with respect to bump-
                stock-type devices. ``Official action that is legislative in nature is
                not subject to the notice and hearing requirements of the due process
                [[Page 66525]]
                clause.'' Interport Pilots Agency, Inc. v. Sammis, 14 F.3d 133, 142 (2d
                Cir. 1994); see also, e.g., Bi-Metallic Inv. Co. v. State Bd. of
                Equalization, 239 U.S. 441, 445 (1915) (``General statutes within the
                state power are passed that affect the person or property of
                individuals, sometimes to the point of ruin, without giving them a
                chance to be heard.''). Furthermore, the Department's conclusion that
                bump-stock-type devices are machineguns under the NFA and GCA means
                that owners lack a cognizable property interest in these devices for
                due-process purposes. As the Fifth Circuit held in Cooper v. City of
                Greenwood, firearms covered by the NFA are ``contraband per se,'' and
                ``[c]ourts will not entertain a claim contesting the confiscation of
                contraband per se because one cannot have a property right in that
                which is not subject to legal possession.'' 904 F.2d 302, 305 (1990).
                c. Violates Ex Post Facto Clause and Bill of Attainder Clause
                Comments Received
                 Numerous commenters asserted that the proposed rule would violate
                article I, section 9, clause 3 of the Constitution, which states, ``No
                Bill of Attainder or ex post facto Law shall be passed.'' One gun-
                rights nonprofit organization, quoting United States v. O'Neal, 180
                F.3d 115, 122 (4th Cir. 1999), stated that even though this is a
                regulatory action, the ``sanction or disability it imposes is `so
                punitive in fact' that the law `may not legitimately be viewed as civil
                in nature.' ''
                 Another commenter, the Maryland Shall Issue organization, argued
                that ATF's reliance on 18 U.S.C. 922(o) creates an impermissible ex
                post facto law because current owners and manufacturers of bump-stock-
                type devices ``became felons as of the date and time they took
                possession of a bump stock, even though such possession and manufacture
                was then expressly permitted by prior ATF interpretations.'' The
                commenter cited Calder v. Bull, 3 U.S. (3 Dall.) 386, 390 (1798), and
                Peugh v. United States, 569 U.S. 530 (2013), to support its arguments.
                It argued that the ex post facto issue can be avoided by holding that
                the exemption in 18 U.S.C. 922(o)(2)(A) applies where bump-stock-type
                devices are possessed under ``the authority'' of prior ATF rulings.
                Furthermore, the commenter, citing Bowen v. Georgetown University
                Hospital, 488 U.S. 204, 208 (1988), stated that the Supreme Court has
                held that an agency cannot engage in retroactive rulemaking without
                specific congressional authorization. Relying on Fernandez-Vargas v.
                Gonzales, 548 U.S. 30, 36 (2006), the commenter stated there is no
                question that the proposed rule has a retroactive effect because the
                rule would ``affect'' existing rights and impose new liabilities on the
                past and continued possession of bump-stock-type devices.
                 At least one commenter argued the rule is an unconstitutional bill
                of attainder because the rule restricts particular brands of stocks,
                per the Department's definition, while not at the same time restricting
                all brands of stocks. Similarly, another commenter stated the
                regulation appears punitive in nature, and abusively narrow in
                targeting Slide Fire, a seller of bump-stock-type devices that has
                already announced the close of its business.
                Department Response
                 The Department disagrees that the proposed rule violates the Ex
                Post Facto or Bill of Attainder Clauses. The rule would criminalize
                only future conduct, not past possession of bump-stock-type devices
                that ceases by the effective date of this rule. In Calder v. Bull, 3
                U.S. (3 Dall.) 386 (1798), the Supreme Court set out four types of laws
                that violate the Ex Post Facto Clause:
                 1st. Every law that makes an action, done before the passing of
                the law, and which was innocent when done, criminal; and punishes
                such action. 2nd. Every law that aggravates a crime, or makes it
                greater than it was, when committed. 3rd. Every law that changes the
                punishment, and inflicts a greater punishment, than the law annexed
                to the crime, when committed. 4th. Every law that alters the legal
                rules of evidence, and receives less, or different, testimony, than
                the law required at the time of the commission of the offence, in
                order to convict the offender.
                Id. at 390. Citing Calder, the Supreme Court has explained that ``[t]o
                fall within the ex post facto prohibition, a law must be
                retrospective--that is, it must apply to events occurring before its
                enactment--and it must disadvantage the offender affected by it by
                altering the definition of criminal conduct or increasing the
                punishment for the crime.'' Lynce v. Mathis, 519 U.S. 433, 441 (1997)
                (emphasis added; citations and internal quotation marks omitted). The
                Federal courts have thus been careful to distinguish statutes and
                regulations that violate the Ex Post Facto Clause from those that
                criminalize only future conduct and are therefore not
                ``retrospective,'' including in the firearms possession context. For
                example, following passage of the Lautenberg Amendment (18 U.S.C.
                922(g)(9)), which made it unlawful for persons convicted of a
                misdemeanor crime of domestic violence to possess a firearm, several
                defendants argued that the law violated the Ex Post Facto Clause. One
                defendant argued that he had a prior conviction for a misdemeanor crime
                of domestic violence, but lawfully possessed a firearm before 18 U.S.C.
                922(g)(9) became law. United States v. Mitchell, 209 F.3d 319 (4th Cir.
                2000). The defendant argued that, as applied to him, the statute
                violated the Ex Post Facto Clause because the new law penalized him for
                his previous domestic violence conviction. However, the Fourth Circuit
                disagreed, noting that ``[i]t is immaterial that Mitchell's firearm
                purchase and domestic violence conviction occurred prior to Sec.
                922(g)(9)'s enactment because the conduct prohibited by Sec. 922(g)(9)
                is the possession of a firearm.'' Id. at 322; see also United States v.
                Pfeifer, 371 F.3d 430, 436-37 (8th Cir. 2004); United States v. Meade,
                986 F. Supp. 66, 69 (D. Mass. 1997), aff'd, 175 F.2d 215 (1st Cir.
                1999); United States v. Brady, 26 F.3d 282, 290-91 (2d Cir. 1994);
                United States v. Gillies, 851 F.2d 492, 495-96 (1st Cir. 1988) (Breyer,
                J.); United States v. D'Angelo, 819 F.2d 1062, 1065-66 (11th Cir.
                1987).
                 This rule brings clarity to the meaning of ``machinegun,'' and
                makes clear that individuals are subject to criminal liability only for
                possessing bump-stock-type devices after the effective date of
                regulation, not for possession before that date. No action taken before
                the effective date of the regulation is affected under the rule.
                Although regulating past possession of a firearm may implicate the Ex
                Post Facto Clause, regulating the continued or future possession of a
                firearm that is already possessed does not. See Benedetto v. Sessions,
                No. CCB-17-0058; 2017 WL 4310089, at *5 (D. Md. Sept. 27, 2017)
                (``Whether a gun was purchased before the challenged law was enacted .
                . . is immaterial to whether the challenged law regulates conduct that
                occurred before or after its enactment.''); see also Samuels v.
                McCurdy, 267 U.S. 188, 193 (1925) (rejecting Ex Post Facto Clause
                challenge to statute that prohibited the post-enactment possession of
                intoxicating liquor, even when the liquor was lawfully acquired before
                the statute's enactment). For this reason, the Department disagrees
                with commenters' assertions that the rule violates the Ex Post Facto
                Clause.
                 Relatedly, the Department also disagrees with the view that 18
                U.S.C. 922(o)(2)(A) provides the authority to permit continued
                possession of bump-stock-type devices ``under the
                [[Page 66526]]
                authority'' of prior ATF rulings. Section 922(o)(2)(A) is inapplicable
                because, among other reasons, ATF's letter rulings regarding bump-
                stock-type devices did not purport to authorize the possession of
                devices qualifying as machineguns under section 922(o)(1); instead, ATF
                advised individuals that certain devices did not qualify as machineguns
                in the first place, a position that ATF has now reconsidered.
                Furthermore, section 922(o)(2)(A) does not empower ATF to freely grant
                exemptions from section 922's general prohibition of machineguns.
                 The Department also disagrees that the proposed rule constitutes a
                bill of attainder. The Supreme Court has highlighted the fact that the
                Bill of Attainder Clause applies only to Congress, noting that ``[t]he
                distinguishing feature of a bill of attainder is the substitution of a
                legislative for a judicial determination of guilt.'' De Veau v.
                Braisted, 363 U.S. 144, 160 (1960) (emphasis added). The Court has also
                described a bill of attainder as ``a law that legislatively determines
                guilt and inflicts punishment upon an identifiable individual without
                provision of the protections of a judicial trial.'' Nixon v. Adm'r of
                Gen. Servs., 433 U.S. 425, 468 (1977) (emphasis added). Accordingly,
                the Bill of Attainder Clause does not apply ``to regulations
                promulgated by an executive agency.'' Paradissiotis v. Rubin, 171 F.3d
                983, 988-89 (5th Cir. 1999) (citing Walmer v. U.S. Dep't of Defense, 52
                F.3d 851, 855 (10th Cir. 1995) (``The bulk of authority suggests that
                the constitutional prohibition against bills of attainder applies to
                legislative acts, not to regulatory actions of administrative
                agencies.'')); see also Korte v. Office of Personnel Mgmt., 797 F.2d
                967, 972 (Fed. Cir. 1986); Marshall v. Sawyer, 365 F.2d 105, 111 (9th
                Cir. 1966). Even if the proposed rule were subject to the Bill of
                Attainder Clause, it would pass constitutional muster. The fact that
                Slide Fire announced the close of its business does not make this rule
                a bill of attainder; that company is not being singled out, as the
                proposed rule applies to all similar devices. Further, the regulation
                of all machineguns of this type is not a ``punishment'' as is required
                for an enactment to be unlawful bill of attainder. See Nixon, 433 U.S.
                at 473.
                d. Violates Fourth Amendment
                Comments Received
                 Many commenters also raised objections on grounds that the proposed
                rule violates the Fourth Amendment's guarantee against unreasonable
                searches and seizures. Commenters believed that because bump-stock-type
                devices essentially would become contraband under the rule, ``mandating
                [their] surrender to authorities would violate the 4th Amendment
                protection from seizure without due process.''
                Department Response
                 Although commenters cite the Fourth Amendment, it is unclear how a
                ``search'' or ``seizure'' would result from this rule. The Department
                is unaware of any precedent supporting the view that a general
                regulatory prohibition of possession of certain contraband can violate
                the Fourth Amendment. A seizure in ``[v]iolation of the Fourth
                Amendment requires an intentional acquisition of physical control,''
                Brower v. Cty. of Inyo, 489 U.S. 593, 596 (1989), and the final rule
                makes clear that current possessors of bump-stock-type devices are not
                required to surrender the devices to the authorities. Instead, current
                possessors may lawfully dispose of their devices in other ways, as
                discussed below in Part IV.D.7.
                e. Violates Ninth and Tenth Amendments
                Comments Received
                 Various commenters opposed to the rule stated that it would violate
                the Ninth and Tenth Amendments of the Constitution. The Ninth Amendment
                provides: ``The enumeration in the Constitution, of certain rights,
                shall not be construed to deny or disparage others retained by the
                people.'' The Tenth Amendment provides: ``The powers not delegated to
                the United States by the Constitution, nor prohibited by it to the
                States, are reserved to the States respectively, or to the people.''
                One commenter said, ``The BATF is another agency whose existence
                violates the 10th Amendment.'' Another commenter argued, ``as an
                accessory, the federal government cannot ban [bump-stock-type devices],
                because only the states can ban them.'' A handful of other commenters
                stated that the rule violates States' rights under the Tenth Amendment
                because it violates the ``right to keep and bear arms'' provisions of
                44 State constitutions.
                Department Response
                 The Department disagrees that the proposed rule violates the
                commenters' rights under the Ninth Amendment. The Ninth Amendment
                ``does not confer substantive rights in addition to those conferred by
                other portions of our governing law. The Ninth Amendment `was added to
                the Bill of Rights to ensure that the maxim expressio unius est
                exclusio alterius would not be used at a later time to deny fundamental
                rights merely because they were not specifically enumerated in the
                Constitution.' '' Gibson v. Matthews, 926 F.2d 532, 537 (6th Cir. 1991)
                (citing Charles v. Brown, 495 F. Supp. 862, 863-64 (N.D. Ala. 1980)).
                Federal ``circuit courts across the country have consistently held that
                the Ninth Amendment does not impinge upon Congress's authority to
                restrict firearm ownership.'' United States v. Finnell, 256 F. Supp. 2d
                493, 498 (E.D. Va. 2003).
                 The Department also disagrees that the rule violates the Tenth
                Amendment. Commenters seemingly argued that the powers exercised by the
                Department in issuing the rule were ``powers not delegated to the
                United States by the Constitution, nor prohibited by it to the
                States.'' However, Federal courts have long held that the NFA, GCA, and
                implementing regulations do not violate the Tenth Amendment. The NFA
                does not ``usurp[ ] police power reserved to the States.'' United
                States v. Miller, 307 U.S. 174, 176 (1939). Further, ``[b]ecause Sec.
                922(o) was a proper exercise of Congress's enumerated authority under
                the Commerce Clause, and because it does not compel, let alone
                commandeer, the states to do anything, the statute does not violate the
                Tenth Amendment.'' United States v. Kenney, 91 F.3d 884, 891 (7th Cir.
                1996).
                f. Lack of Statutory Authority
                Comments Received
                 A total of 47,863 commenters, most of whom sent form submissions
                opposed to the proposed rule, argued that ATF lacks statutory authority
                to regulate bump-stock-type devices. Many commenters said that ATF, by
                its own admission, repeatedly stated it could not regulate such
                devices. Commenters generally expressed the view that because bump-
                stock-type devices are not firearms, ATF has no authority under the NFA
                or GCA to regulate them. Some commenters contended that 6 U.S.C. 531
                gives ATF only narrow statutory authority and does not provide ATF
                general authority to regulate the safety of firearms, accessories, or
                parts.
                 In addition, numerous commenters argued that, as the term
                ``machinegun'' is already clearly defined in the NFA, only Congress can
                make changes to the definition and regulate bump-stock-type devices.
                Furthermore, commenters stated that the agency's interpretation of the
                term ``machinegun'' would not be entitled to deference under Chevron
                U.S.A. v. Natural Resources Defense Council, 467 U.S. 837 (1984).
                [[Page 66527]]
                Department Response
                 The Attorney General is responsible for enforcing the NFA, as
                amended, and the GCA, as amended. This includes the authority to
                promulgate regulations necessary to enforce the provisions of these
                statutes. See 18 U.S.C. 926(a); 26 U.S.C. 7801(a)(2)(A), 7805(a). The
                statutory provision cited by some commenters, 6 U.S.C. 531, is the
                provision of the Homeland Security Act of 2002, Public Law 107-296, 116
                Stat. 2135, that transferred the powers the Secretary of the Treasury
                had with respect to ATF to the Attorney General when ATF was
                transferred to the Department of Justice. Accordingly, the Attorney
                General is now responsible for enforcing the NFA and GCA, and he has
                delegated the responsibility for administering and enforcing the NFA
                and GCA to the Director of ATF, subject to the direction of the
                Attorney General and the Deputy Attorney General. See 28 CFR
                0.130(a)(1)-(2).
                 ``Because Sec. 926 authorizes the [Attorney General] to promulgate
                those regulations which are `necessary,' it almost inevitably confers
                some measure of discretion to determine what regulations are in fact
                `necessary.''' Nat'l Rifle Ass'n v. Brady, 914 F.2d 475, 479 (4th Cir.
                1990). In the original GCA implementing regulations, ATF provided
                regulatory definitions of the terms that Congress did not define in the
                statute. 33 FR 18555 (Dec. 14, 1968). Since 1968, ATF has occasionally
                added definitions to the implementing regulations. See, e.g., 63 FR
                35520 (June 30, 1998). Similarly, 26 U.S.C. 7805(a) states that ``the
                [Attorney General] shall prescribe all needful rules and regulations
                for the enforcement of this title.'' As is the case with the GCA, ATF
                has provided regulatory definitions for terms in the NFA that Congress
                did not define, such as ``frame or receiver'' and ``manual reloading.''
                See, e.g., 81 FR 2658 (Jan. 15, 2016). These definitions were necessary
                to explain and implement the statute, and do not contradict the
                statute. Federal courts have recognized ATF's authority to classify
                devices as ``firearms'' under Federal law. See, e.g., Demko v. United
                States, 44 Fed. Cl. 83, 93 (1999) (destructive device); Akins v. United
                States, 312 F. App'x 197 (11th Cir. 2009) (per curiam) (machinegun).
                 This rule is based upon this authority. Further, ATF has provided
                technical and legal reasons why bump-stock-type devices enable
                automatic fire by a single function of the trigger, and thus qualify as
                machinegun conversion devices, not mere ``accessories.'' ATF has
                regularly classified items as machinegun ``conversion devices'' or
                ``combinations of parts,'' including auto sears (ATF Ruling 81-4) and
                the Akins Accelerator (ATF Ruling 2006-2).
                 The Department agrees that regulatory agencies may not promulgate
                rules that conflict with statutes. However, the Department disagrees
                that the rule conflicts with the statutes or is in contravention of
                administrative-law principles. The rule merely defines terms used in
                the definition of ``machinegun'' that Congress did not--the terms
                ``automatically'' and ``single function of the trigger''--as part of
                implementing the provisions of the NFA and GCA.
                 When a court is called upon to review an agency's construction of
                the statute it administers, the court looks to the framework set forth
                in Chevron U.S.A., Inc. v. Natural Resources Defense Council, Inc., 467
                U.S. 837, 842-43 (1984). The first step of the Chevron review is to ask
                ``whether Congress has directly spoken to the precise question at
                issue.'' Id. at 842. ``If the intent of Congress is clear, that is the
                end of the matter; for the court, as well as the agency, must give
                effect to the unambiguously expressed intent of Congress. If, however,
                the court determines Congress has not directly addressed the precise
                question at issue . . . . the question for the court is whether the
                agency's answer is based on a permissible construction of the
                statute.'' Id. at 842-43 (footnote omitted).
                 The Department believes that this rule's interpretations of
                ``automatically'' and ``single function of the trigger'' in the
                statutory definition of ``machinegun'' accord with the plain meaning of
                those terms. Moreover, even if those terms are ambiguous, this rule
                rests on a reasonable construction of them. Although Congress defined
                ``machinegun'' in the NFA, 26 U.S.C. 5845(b), it did not further define
                the components of that definition. See, e.g., United States v. One TRW,
                Model M14, 7.62 Caliber Rifle, 441 F.3d 416, 419 (6th Cir. 2006)
                (noting that the NFA does not define the phrases ``designed to shoot''
                or ``can be readily restored'' in the definition of ``machinegun'').
                Congress thus implicitly left it to the Department to define
                ``automatically'' and ``single function of the trigger'' in the event
                those terms are ambiguous. See Chevron, 467 U.S. at 844. Courts have
                appropriately recognized that the Department has the authority to
                interpret elements of the definition of ``machinegun'' like
                ``automatically'' and ``single function of the trigger.'' See York v.
                Sec'y of Treasury, 774 F.2d 417, 419-20 (10th Cir. 1985); United States
                v. Dodson, 519 F. App'x 344, 348-49 & n.4 (6th Cir. 2013); cf., e.g.,
                Firearms Import/Export Roundtable Trade Grp. v. Jones, 854 F. Supp. 2d
                1, 18 (D.D.C. 2012) (upholding ATF's interpretation of 18 U.S.C. 925(d)
                to ban importation of certain firearm parts under Chevron ``step
                one''); Modern Muzzleloading, Inc. v. Magaw, 18 F. Supp. 2d 29, 35-36
                (D.D.C. 1998) (``since the ATF's classification of [a firearm as not
                antique] `amounts to or involves its interpretation' of the GCA, a
                statute administered by the ATF, we review that interpretation under
                the deferential standard announced in Chevron'').
                 Second, the Department's construction of those terms is reasonable
                under Chevron. As explained in more detail in Part III, the Department
                is clarifying its regulatory definition of ``automatically'' to conform
                to how that word was understood and used when the NFA was enacted in
                1934. See Olofson, 563 F.3d at 658. And the Department is reaffirming
                that a single pull of the trigger is a single function of the trigger,
                consistent with the NFA's legislative history, ATF's previous
                determinations, and judicial precedent. See, e.g., Akins, 312 F. App'x
                at 200. This rule is therefore lawful under the NFA and GCA even if the
                operative statutory terms are ambiguous.
                g. Violation of the Americans With Disabilities Act
                Comments Received
                 A few commenters indicated that bump-stock-type devices are
                assistive devices for people with nerve damage or a physical
                disability. A few commenters further stated that the regulation could
                be a violation of the Americans with Disabilities Act (ADA), 42 U.S.C.
                ch. 126. In particular, one commenter claimed that under the ADA, an
                individual can establish coverage under the law by ``showing that he or
                she has been subjected to an action prohibited under the Act because of
                an actual or perceived physical [condition] that is not transitory and
                minor.'' The commenter asserted that this regulation constitutes such
                ``an action'' and would violate the civil rights of a diverse group of
                persons with disabilities, including homeowners, veterans, target
                shooters, and hunters.
                Department Response
                 The Department disagrees with commenters that the final rule would
                violate the ADA. While the ADA applies to State and local governments,
                it does not apply to the Executive Branch of the Federal Government.
                See 42 U.S.C. 12131(1) (defining ``public entity'' as
                [[Page 66528]]
                any State or local government; any department, agency, special purpose
                district, or other instrumentality of a State or States or local
                government; and the National Railroad Passenger Corporation, and any
                commuter authority). Accordingly, because ATF is a Federal agency that
                is not subject to the ADA, the commenters' assertion that ATF's
                regulation would violate the ADA is incorrect.
                 While not mentioned by commenters, ATF is covered by section 504 of
                the Rehabilitation Act of 1973, which prohibits discrimination, solely
                by reason of disability, in Federally conducted programs and
                activities. 29 U.S.C. 794(a) (stating that ``[n]o otherwise qualified
                individual with a disability . . . shall, solely by reason of her or
                his disability, be excluded from the participation in, be denied the
                benefits of, or be subjected to discrimination under . . . any program
                or activity conducted by any Executive agency''). As detailed above,
                the sole purpose of this rulemaking is to clarify that bump-stock-type
                devices satisfy the statutory definition of ``machinegun,'' as defined
                by Congress in the NFA and GCA. While a few commenters made general
                assertions that bump-stock-type devices can be used as assistive
                devices for people with disabilities, none submitted any specific
                information to suggest that this rule would cause qualified individuals
                with disabilities, solely by reason of their disability, to be excluded
                from the participation in, subjected to discrimination under, or denied
                the benefits of any program or activity of ATF. Accordingly, there is
                nothing in the record to suggest that this rule would raise concerns
                under the Rehabilitation Act.
                2. Politically Motivated and Emotional Response
                Comments Received
                 At least 41,954 commenters opposed to the rule, including the
                40,806 comments submitted through the NAGR petition, asserted that the
                proposed rule is a political or knee-jerk response to a tragic
                incident. Many commenters suggested that the proposed rule reflected
                political pressure and would be a hasty response that would not achieve
                real benefits and could lead to confiscating all guns. A handful of
                commenters even asserted they would support the elimination of ATF.
                Petitions submitted through NAGR portray the rule as a response to
                ``the anti-gun left . . . so they can turn millions of commonly owned
                firearms into `illegal guns' with the stroke of a pen.'' They cautioned
                that this rule unfairly capitalizes on the misfortunes of others to
                push political agendas and that facts should not be thrown aside.
                Another commenter said that this rule will be tainted because from the
                beginning the President made clear he had no intention of instructing
                the Department to abide by the public comments, having declared that
                bump-stock-type devices ``will soon be out'' after the ``mandated
                comment period'' notwithstanding possible congressional action.
                Department Response
                 While the Las Vegas tragedy brought attention to bump-stock-type
                devices and requests from Congress and nongovernmental organizations
                prompted ATF to review its classification of bump-stock-type devices,
                the Department disagrees that this rulemaking is an unreasoned reaction
                to recent events. As discussed in the NPRM, see Part III above, ATF
                recognized that its prior classifications determining only some bump-
                stock-type devices to be machineguns did not include extensive legal
                analysis of certain terms that are significant to defining
                ``machinegun'' under the NFA and were not always consistent. This final
                rule defines the terms ``automatically'' and ``single function of the
                trigger'' to clarify the meaning of machinegun and to make clear that
                bump-stock-type devices are machineguns under the meaning of the
                statute. The Department further notes that the President specifically
                directed it to clarify the legal status of bump-stock-type devices
                through the administrative ``procedures the law prescribes,'' including
                notice and comment. 83 FR 7949 (Feb. 23, 2018).
                3. Not Used in Criminal Activity
                Comments Received
                 Numerous commenters expressed that besides the shooting in Las
                Vegas, there is no evidence that bump-stock-type devices have been used
                in the commission of crimes. Several commenters stated that, pursuant
                to a Freedom of Information Act request, they asked ATF and the Federal
                Bureau of Investigation (FBI) for any records on whether bump-stock-
                type devices have been used in crimes and that they received no
                confirmation affirming the existence of any such records. Moreover,
                some commenters stated that ATF provided no evidence or justification
                that bump-stock-type devices will be used more frequently in future
                crimes. They argued that if the agency cannot show what materials it
                relied on to regulate bump-stock-type devices for purposes of public
                safety, then the rulemaking is arbitrary and capricious under the APA.
                Commenters cited judicial decisions such as Motor Vehicle Manufacturers
                Ass'n v. State Farm Mutual Automobile Insurance Co., 463 U.S. 29, 52
                (1983), in which the Supreme Court held that when an agency rescinds or
                changes its stance on a regulation, it must explain the evidence
                underlying its decision and offer a rational connection between the
                facts found and the choice made.
                 Many commenters also noted that there is still no confirmation or
                documentation, despite requests, from Federal agencies confirming that
                bump-stock-type devices were actually used in the Las Vegas incident,
                and that ATF has not issued a ``Report of Technical Examination'' (ATF
                Form 3311.2) for any of the firearms used in the incident. With
                questions remaining about the Las Vegas criminal investigation and
                doubts as to whether bump-stock-type devices were actually used,
                commenters argued that ATF has no basis to promulgate a regulation
                that, as ATF declared in the NPRM, ``would affect the criminal use of
                bump-stock-type devices in mass shootings, such as the Las Vegas
                shooting incident.'' 83 FR at 13454.
                 These arguments were frequently raised alongside concerns that the
                cost-benefit analysis did not address the fact that there would be few
                benefits to the rule given that bump-stock-type devices have supposedly
                been used in only one crime. These concerns are addressed in Part
                IV.I.5.
                Department Response
                 The Department disagrees that ATF seeks to regulate bump-stock-type
                devices merely because they were, or have the potential to be, used in
                crime. The NPRM stated that the Las Vegas shooting made ``individuals
                aware that these devices exist--potentially including persons with
                criminal or terrorist intentions--and made their potential to threaten
                public safety obvious.'' 83 FR at 13447. But the NRPM also provided a
                detailed analysis explaining that bump-stock-type devices must be
                regulated because they satisfy the statutory definition of
                ``machinegun'' as it is defined in the NFA and GCA. Id. at 13447-48.
                 Commenters conflate the legal basis for ATF's regulation of bump-
                stock-type devices with the background information that was provided as
                context for the reason ATF revisited its previous classifications. In
                the NPRM, ATF explained that the tragedy in Las Vegas gave rise to
                requests from Congress and nongovernmental organizations that ATF
                examine its past
                [[Page 66529]]
                classifications and determine whether bump-stock-type devices currently
                on the market constitute machineguns under the statutory definition.
                Id. at 13446. While part of the Department's mission is to enhance
                public safety, the impetus for the change in classification was not, as
                commenters argued, that the device may potentially pose a public safety
                threat but because, upon review, ATF believes that it satisfies the
                statutory definition of ``machinegun.'' This rule reflects the public
                safety objectives of the NFA and GCA, but the materials and evidence of
                public safety implications that commenters seek have no bearing on
                whether these devices are appropriately considered machineguns based on
                the statutory definition.
                 In Motor Vehicle Manufacturers Ass'n v. State Farm Mutual
                Automobile Insurance Co., 463 U.S. 29 (1983), the Supreme Court wrote
                that an ``agency must examine the relevant data and articulate a
                satisfactory explanation for its action including a `rational
                connection between the facts found and the choice made.' '' Id. at 43
                (quoting Burlington Truck Lines, Inc. v. United States, 371 U.S. 156,
                168 (1962)). However, that case involved a Federal agency that
                rescinded a final rule--based on data and policy choices--shortly after
                publication, arguing that that rule was no longer necessary for a
                multitude of reasons, including that the costs outweighed the safety
                benefits. See id. at 38-39. The Supreme Court recognized that any
                change requires a reasoned basis, noting that ``[i]f Congress
                established a presumption from which judicial review should start, that
                presumption--contrary to petitioners' views--is not against safety
                regulation, but against changes in current policy that are not
                justified by the rulemaking record.'' Id. at 42. However, the
                revocation in that case involved a discretionary policy decision, and
                did not depend solely upon statutory construction. The bump-stock-type
                device rule is not a discretionary policy decision based upon a myriad
                of factors that the agency must weigh, but is instead based only upon
                the functioning of the device and the application of the relevant
                statutory definition. Therefore, the Department does not believe that
                this rule conflicts with State Farm.
                4. Will Not Enhance Public Safety
                Comments Received
                 More than 1,100 commenters indicated that a regulation on bump-
                stock-type devices would have no measurable effect on the current rate
                of crime or enhance public safety. One commenter argued that the use of
                bump-stock-type devices by mass shooters might actually save lives
                based on his experience that using the device can result in a rifle
                jamming, misfeeding, or misfiring, which would be the best time to
                disrupt a shooter. Other commenters noted that bump-stock-type devices
                actually impede a shooter's ability to fire accurately. Commenters
                stated that there is currently no empirical evidence that further
                firearms regulations would reduce crime or safeguard people more
                effectively. One commenter, for example, estimated that out of the tens
                of thousands of gun deaths per year, most of which he stated are
                suicides, the proposed rule would only impact a minute percentage,
                while another commenter opined that crime rate data from the FBI show
                that areas with more firearms restrictions have more crime. A handful
                of commenters pointed to Chicago as having some of the most stringent
                gun restrictions yet continuing to have high rates of homicide and gun-
                related deaths that ``surpass[] war zones.''
                 Many commenters opposed to the regulation maintained that neither
                this rule nor any new gun laws will prevent criminals or people with
                malicious intent from proceeding to commit crimes. Several voiced the
                opinion that people determined to kill many people will find other
                means, such as cars, knives, toxic substances, homemade explosives, or
                any other object. The problem, they argued, is not the object, but the
                person who controls it--and that criminals will do whatever they can to
                accomplish unlawful ends. One commenter, identifying as a law
                enforcement officer, wrote that he frequently encounters prohibited
                possessors who still somehow obtain a firearm and do not care about the
                consequences. Another commenter stated that the fact that the shooter
                in Las Vegas was well aware that murder is unlawful but chose to ignore
                the law only serves as proof that laws do not stop evildoers.
                 Additionally, several hundred commenters stated that ATF should
                focus its time and energy on enforcing existing gun laws and
                regulations rather than issuing a new one. One commenter, a former
                corrections officer from Baltimore, suggested that time would be better
                spent prosecuting criminals for crimes on the books. Similarly, another
                commenter noted that ``[w]hen the courtrooms are revolving doors that
                push gang members right back out,'' the problem is not the lack of laws
                but rather a lack of tools and resources devoted to enforcing the
                existing laws. Some commenters remarked that had there been better
                policing, certain mass shootings could have been avoided.
                Department Response
                 The Department agrees with the commenters that the existing laws
                should be enforced, and the Department is committed to addressing
                significant violent crime problems facing our communities. No law or
                regulation entirely prevents particular crimes, but the Las Vegas
                shooting illustrated the particularly destructive capacity of bump-
                stock-type devices when used in mass shooting incidents. In any event,
                the impetus for this rule is the Department's belief, after a detailed
                review, that bump-stock-type devices satisfy the statutory definition
                of ``machinegun.'' Through the NFA and GCA, Congress took steps to
                regulate machineguns because it determined that machineguns were a
                public safety threat. ATF must therefore classify devices that satisfy
                the statutory definition of ``machinegun'' as machineguns. The proposed
                rule is thus lawful and necessary to provide public guidance on the
                law.
                5. Punishes Law-Abiding Citizens
                Comments Received
                 At least 2,103 commenters opposed the rule on the ground that it
                would punish law-abiding citizens and would turn them instantly into
                potential felons. They asserted that hundreds of thousands of law-
                abiding citizens are being punished for the acts of one evil person and
                that the overwhelming majority use bump-stock-type devices lawfully and
                for fun. Many commenters, some of whom do not own a bump-stock-type
                device, objected that owners of these devices would become felons
                overnight just for owning a piece of plastic that is not needed to
                achieve bump firing. They further pointed out that because there is no
                grandfathering provision, law-abiding gun owners would have to
                surrender any bump-stock-type devices after having spent money to buy
                them. Many raised these objections in connection with concerns that the
                rule is unconstitutional under the Ex Post Facto Clause and the Takings
                Clause of the Constitution, as already discussed in this preamble.
                Moreover, some commenters, concerned that the rule's proposed language
                could later apply to other trigger assemblies, stated that thousands of
                law-abiding citizens may eventually become criminals overnight for
                simply owning a non-factory trigger.
                [[Page 66530]]
                Department Response
                 The Department disagrees that law-abiding citizens would instantly
                become felons under this rule. This final rule provides specific
                information about acceptable methods of disposal, as well as the
                timeframe under which disposal must be accomplished to avoid violating
                18 U.S.C. 922(o). Current possessors of bump-stock-type devices who
                properly destroy or abandon their devices will avoid criminal
                liability. As described in Part IV.D.1.b, this is not a compensable
                ``taking'' of property under the Constitution.
                6. Other Priorities and Efficiencies
                Comments Received
                 Hundreds of commenters who oppose the rule suggested that the focus
                should not be on any new gun regulation but rather on an array of other
                issues, including addressing mental health, drug addiction, education,
                civility, and the decline of parenting and morals. Many argued that
                more resources should be devoted to treating the mentally ill or to the
                opioid epidemic, including ensuring that law enforcement and mental
                health agencies have the power to incarcerate and institutionalize
                people who are a danger to themselves or others. Several others
                suggested that resources should be devoted to securing public spaces,
                observing that the U.S. Capitol and all Federal buildings have armed
                security but many schools and workplaces do not. Numerous commenters
                noted that other improvements are needed before any new gun restriction
                is pursued, such as improving records in the National Instant Criminal
                Background Check System (NICS), properly charging persons with crimes
                that would bar them from owning firearms, or addressing bullying and
                teaching morals and the Bible in schools. One commenter suggested the
                Government investigate the social changes that are turning men into
                killers, while another said that to make a difference, one needs to go
                after the videogame industry and Hollywood movies that glorify carnage,
                body counts, murder, and violence. Commenters argued that only once
                these issues are tackled can discussion of new gun regulations begin.
                Department Response
                 The Department acknowledges comments regarding treatment of mental
                health and drug addiction, securing schools and workplaces, improving
                records in the NICS system, and various social issues. The Department
                agrees that these are important issues, but they are outside the scope
                of this rulemaking. Several of these matters were raised as
                alternatives for the Department to consider. See Part IV.F for further
                discussion of alternatives.
                7. Enforcement and Compliance
                Comments Received
                 Some commenters questioned how ATF will enforce this regulation,
                and a few stated that they or people they know of will not comply with
                this rule should it go into effect. Several questioned whether the
                agency would send armed agents to visit homes and confiscate bump-
                stock-type devices, while others pointed out that because bump-stock-
                type devices have not been tracked in any way, confiscation will depend
                on volunteers. Commenters highlighted the lack of success that certain
                States, such as Massachusetts, have had in collecting bump-stock-type
                devices after passing laws restricting their possession. Many
                commenters suggested it would be a waste of ATF employees' time and
                public funds for ATF to implement the rule. Several others remarked
                that confiscation or enforcement would be easily circumvented because
                new technology like 3D printing and CNC (Computer Numeric Control)
                equipment (computerized milling machines), or even traditional
                manufacturing methods, will facilitate a black market in homemade bump-
                stock-type devices. One commenter submitted to ATF ``a fully
                functional'' bump-stock equivalent that was created ``using super glue,
                2-part epoxy, an AR-15 A2 pistol grip, threaded steel rods, and small
                ABS plastic bricks [i.e., Legos].''
                Department Response
                 The Department acknowledges comments on enforcement of and
                compliance with the rule. As stated in the NPRM, current possessors of
                bump-stock-type devices will be obligated to dispose of these devices.
                Acceptable methods of destruction include completely melting,
                shredding, or crushing the device. If the device is made of metal, an
                alternative acceptable method of destruction is using an oxy/acetylene
                torch to make three angled cuts that completely severs design features
                critical to the functionality of the bump-stock-type device. Each cut
                should remove at least \1/4\ inch of metal per cut. Any method of
                destruction must render the device so that it is not readily restorable
                to a firing condition or is otherwise reduced to scrap. However, as the
                majority of bump-stock-type devices are made of plastic material,
                individuals may use a hammer to break them apart so that the device is
                not readily restorable to a firing condition or is otherwise reduced to
                scrap, and throw the pieces away.
                 Current possessors are encouraged to undertake destruction of the
                devices. However, current possessors also have the option to abandon
                bump-stock-type devices at the nearest ATF office.
                 Current possessors of bump-stock-type devices will have until the
                effective date of the rule (90 days from the date of publication in the
                Federal Register) to comply. Additional information on the destruction
                of bump-stock-type devices will be available at www.atf.gov.
                8. Lack of Consistency
                Comments Received
                 Hundreds of commenters indicated that ATF's reversal of position
                from its earlier determinations and insistence that a bump-stock-type
                device now qualifies as a machinegun under the NFA ``hurts [the
                agency's] credibility.'' As one commenter remarked, the perpetual state
                of inconsistencies, whereby products are approved and then later ruled
                to be illegal by ATF, ``creates an air of fear and distrust in the
                gunowning public,'' and moreover, ``calls into question the validity
                and competence of the very agency charged with making these
                determinations.'' Several commenters argued that ATF's lack of
                consistency only serves to increase distrust of the agency, the
                Government, and the legal process.
                Department Response
                 The Department acknowledges comments regarding the inconsistency in
                ATF's previous classifications of some bump-stock-type devices as
                machineguns and others as non-machineguns. As described in Part III,
                upon review, ATF recognized that the decisions issued between 2008 and
                2017 did not provide consistent or extensive legal analysis regarding
                the term ``automatically'' as that term applies to bump-stock-type
                devices. Consistent with its authority to reconsider and rectify its
                past classifications, the Department accordingly clarifies that the
                definition of ``machinegun'' in the NFA and GCA includes bump-stock-
                type devices because they convert an otherwise semiautomatic firearm
                into a machinegun by functioning as a self-acting or self-regulating
                mechanism that harnesses the recoil energy of the semiautomatic firearm
                in a manner that allows the trigger to reset and continue firing
                without additional physical manipulation of the trigger by the shooter.
                The Supreme Court has made clear that this sort of regulatory
                correction is permissible. An agency
                [[Page 66531]]
                may change its course as long as it ``suppl[ies] a reasoned analysis
                for the change,'' which the Department has done at length in the NPRM
                and this final rule. Motor Vehicle Mfrs. Ass'n v. State Farm Mut. Auto.
                Ins. Co., 463 U.S. 29, 42 (1983). And the agency bears no heightened
                burden in prescribing regulations that displace inconsistent previous
                regulatory actions. FCC v. Fox Television Stations, Inc., 556 U.S. 502,
                514-15 (2009).
                9. Earlier Determinations Correct
                Comments Received
                 Over 1,500 commenters opposed to the rule maintained that ATF's
                earlier classifications determining certain bump-stock-type devices not
                to be subject to the NFA or GCA were correct and should not be
                reversed. These commenters stated that reversing this position is
                unnecessary and unlawful. To make the point that ATF is bound by its
                prior determinations, many commenters submitted ATF's own
                classification letters and highlighted the Department's arguments made
                in litigation as evidence that the rule on bump-stock-type devices is
                an arbitrary decision. In particular, commenters cited the Department's
                arguments made in litigation with Freedom Ordnance Manufacturing, Inc.
                (``Freedom Ordnance''), No. 3:16-cv-243 (S.D. Ind. filed Dec. 13,
                2016). There, the Department defended its decision to classify Freedom
                Ordnance's Electronic Reset Assistant Device (ERAD) as a machinegun. In
                responding to Freedom Ordnance's argument that the ERAD was a bump-
                stock-type device and not subject to regulation, the Department stated
                such stocks were not machineguns because ``[b]ump firing requires the
                shooter to manually and simultaneously pull and push the firearm in
                order for it to continue firing.'' Brief for ATF in Support of Motion
                for Summary Judgment and in Opposition to Plaintiff's Motion for
                Summary Judgment, ECF No. 28, at 21 (July 27, 2017). These prior
                decisions and admissions, commenters argued, preclude the Department
                from suddenly reversing its decision.
                Department Response
                 The Department acknowledges that ATF previously determined that
                certain bump-stock-type devices were not ``machineguns'' under the law.
                The Department notes, however, that a great deal of its analysis in the
                Freedom Ordnance litigation was fully consistent with its position in
                this rule. For example, the Department adhered to its view that a
                single pull is a ``single function'' of the trigger, see id. at 13-14,
                and it argued that a device that relieves the shooter from having to
                ``pull and release the trigger for each individual, subsequent shot''
                converts the firearm into a machinegun, id. at 22. While the Department
                accepted the previous classification of some bump-stock-type devices as
                non-machineguns, it relied on the mistaken premise that the need for
                ``shooter input'' (i.e., maintenance of pressure) for firing with bump-
                stock-type devices means that such devices do not enable ``automatic''
                firing, see id. at 21--even though Freedom Ordnance's ERAD also
                required maintenance of pressure by the shooter, see id. at 20.
                 In any event, as explained in the NPRM, the Department believes
                that ATF clearly has authority to ``reconsider and rectify'' its
                classification errors. Akins, 312 F. App'x at 200; see also Fox, 556
                U.S. at 514-15; Hollis v. Lynch, 121 F. Supp. 3d 617, 642 (N.D. Tex.
                2015) (no due process violation in ATF's revocation of mistaken
                approval to manufacture a machinegun). In the NPRM, the Department
                noted that ``ATF has reviewed its original classification
                determinations for bump-stock-type devices from 2008 to 2017 in light
                of its interpretation of the relevant statutory language, namely the
                definition of `machinegun.' '' 83 FR at 13446. The NPRM explained that
                ``ATF's classifications of bump-stock-type devices between 2008 and
                2017 did not include extensive legal analysis of these terms in
                concluding that the bump-stock-type devices at issue were not
                `machineguns.' '' Id. Specifically, some of these rulings concluded
                that such devices were not machineguns because they did not ```initiate
                [ ] an automatic firing cycle that continues until either the finger is
                released or the ammunition supply is exhausted,' '' but did not provide
                a definition or explanation of the term ``automatically.'' Id. at
                13445. This is precisely the purpose of this rule. As explained in more
                detail in Part III, the Department has determined that bump-stock-type
                devices enable a shooter to initiate an automatic firing sequence with
                a single pull of the trigger, making the devices machineguns under the
                NFA and GCA. Consistent with the APA, this rule is the appropriate
                means for ATF to set forth its analysis for its changed assessment. See
                Motor Vehicle Mfrs. Ass'n v. State Farm Mut. Auto Ins. Co., 463 U.S.
                29, 57 (1983).
                10. Bump Firing and Bump-Stock-Type Device Operation
                a. Bump-Stock-Type Device Operation
                Comments Received
                 More than 17,000 commenters argued that ATF cannot proceed because
                its description of how bump-stock-type devices operate is inaccurate
                and that the proposed rule is based on a false premise. Commenters
                emphatically argued that bump-stock-type devices do not make a
                semiautomatic firearm shoot automatically by a single function of the
                trigger. They stated: (1) No part of the bump-stock-type device touches
                the trigger itself, but rather touches only the shooter's trigger
                finger, and (2) if bump-stock-type devices made semiautomatic rifles
                fully automatic, then holding the gun with only the trigger finger hand
                while depressing the trigger should cause the gun to repeatedly fire,
                which does not happen when a rifle is affixed with a bump-stock-type
                device. One commenter said that should ATF be asked to demonstrate the
                firing of a rifle equipped with a bump-stock-type device with the
                shooter only using his trigger hand, and no coordinated input from the
                other hand, it could not be done, as it requires two hands, skill, and
                coordination. Similarly, another commenter asserted that while various
                manual bump-firing techniques ``vary in difficulty and are arguably
                more difficult to master than the use of a bump-stock-type device, the
                fact is that they use exactly the same principle as a bump-stock-type
                device without the use of such a device, and thus the device itself
                cannot be the `primary impetus for a firing sequence' as described.''
                 Several commenters raised specific objections to ATF's description
                in the NPRM that a bump-stock-type device ``harnesses the recoil energy
                [of a firearm] to slide the firearm back and forth so that the trigger
                automatically re-engages by `bumping' the shooter's stationary trigger
                finger without additional physical manipulation of the trigger by the
                shooter'' and that the device is ``a self-acting and self-regulating
                force that channels the firearm's recoil energy in a continuous back-
                and-forth cycle that allows the shooter to attain continuous firing
                after a single pull of the trigger so long as the trigger finger
                remains stationary on the device's extension ledge (as designed).'' 83
                FR at 13443. These commenters disputed these descriptions, stating that
                a bump-stock-type device does not harness any recoil energy and there
                is nothing that makes it an energy sink (such as a spring) that stores
                recoil
                [[Page 66532]]
                energy to move the firearm forward. Further, they argued that further
                physical manipulation is required to operate a firearm equipped with a
                bump-stock-type device--specifically, the shooter must physically
                manipulate the trigger after every shot fired by pushing the firearm
                forward to re-engage the trigger.
                 The bump-stock firing sequence is not automatic, commenters argued,
                because trigger reset is not caused by a mechanical device, part, or
                combination of parts associated with pulling the trigger. Reset occurs,
                they said, only if continuous forward motion and pressure is applied by
                the non-trigger hand or arm of the shooter, not the device. As
                described by some commenters, ``[t]he trigger of a semiautomatic
                firearm in a bump-stock type device is being repeatedly actuated,
                functioned, pulled (take your pick) by the non trigger hand of the
                shooter pushing the firearm forward. That actuation, function, [or]
                pull can and often does occur entirely independent of recoil. Recoil is
                incidental to the firing sequence of a bump-stock type device equipped
                semiautomatic firearm, not intrinsic.'' In challenging ATF's proposed
                rule and description of how these devices operate, one commenter asked
                ATF to provide the history of the machinegun and semiautomatic
                firearms, along with a discussion of the differences between the
                mechanical and legal definitions.
                 In sum, commenters argued that because ATF's premise of how bump-
                stock-type devices operate is inaccurate, there is no basis for ATF to
                regulate them as machineguns.
                Department Response
                 The Department disagrees that ATF's description of how bump-stock-
                type devices operate is inaccurate. ATF explained that bump-stock-type
                devices ``are generally designed to operate with the shooter
                shouldering the stock of the device (in essentially the same manner a
                shooter would use an unmodified semiautomatic shoulder stock),
                maintaining constant forward pressure with the non-trigger hand on the
                barrel-shroud or fore-grip of the rifle, and maintaining the trigger
                finger on the device's extension ledge with constant rearward
                pressure.'' 83 FR at 13443. The Department believes that this
                accurately describes the operation of these devices. Further, ATF
                explained that bump-stock-type devices ``are designed to allow the
                shooter to maintain a continuous firing cycle after a single pull of
                the trigger by directing the recoil energy of the discharged rounds
                into the space created by the sliding stock (approximately 1.5 inches)
                in constrained linear rearward and forward paths.'' Id. This is a
                distinctive feature of bump-stock-type devices and enables the unique
                functioning and operation of these devices. The bump-stock-type device
                captures and harnesses the firearm's recoil to maintain a continuous
                firing sequence, and thus is properly described as ``a self-acting or
                self-regulating mechanism.'' The very purpose of a bump-stock-type
                device is to eliminate the need for the shooter to manually capture,
                harness, or otherwise utilize this energy to fire additional rounds, as
                one would have to do to ``bump fire'' without a bump-stock-type device.
                Further, this mechanism ``allows the firing of multiple rounds through
                a single function of the trigger'' because, as explained in the NPRM,
                ATF's interpretation that the phrase ``single function of the trigger''
                includes a ``single pull of the trigger'' ``is consonant with the
                statute and its legislative history.'' Akins v. United States, 312 F.
                App'x 197, 200 (11th Cir. 2009) (per curiam).
                 The Department agrees with the commenters that ``[n]o part of the
                bump stock touches the trigger, only the shooter[']s trigger finger.''
                However, this is neither legally nor technically determinative. The
                fact that a bump-stock-type device does not touch the trigger does not
                mean that the device has not acted automatically (by directing and
                utilizing recoil energy) or that anything other than a single pull of
                the trigger occurred. That is, the bump-stock-type device remains ``a
                self-acting or self-regulating mechanism'' for the reasons described in
                this section. The fact that bump-stock-type devices do not touch the
                trigger does not mean that they do not qualify as machineguns within
                the meaning of the NFA and GCA. ATF has provided a thorough explanation
                of their functioning, showing that a semiautomatic firearm utilizing a
                bump-stock-type device ``shoots automatically more than one shot,
                without manual reloading, by a single function of the trigger.'' 26
                U.S.C. 5845(b).
                 Additionally, the Department disagrees that to be classified as a
                ``machinegun'' under the NFA, a firearm must fire ``repeatedly'' when a
                shooter holds and fires the gun with only the trigger-finger hand. Any
                such argument misconstrues the meaning of ``automatically.'' As
                explained above, bump-stock-type devices operate automatically because
                their design eliminates the requirement that a shooter manually capture
                and direct recoil energy to fire additional rounds. In this way,
                semiautomatic firearms shoot ``automatically'' when equipped with bump-
                stock-type devices in that their recoil energy is channeled through
                these ``self-acting or self-regulating mechanisms.'' The commenters'
                positions reflect previous analysis that ATF is now correcting. ATF
                explained above that ``[p]rior ATF rulings concerning bump-stock-type
                devices have not provided substantial legal analysis regarding the
                meaning of the term `automatically' as it is used in the GCA and NFA.''
                83 FR at 13445.
                 The Department disagrees that a shooter repeatedly actuates,
                functions, or pulls the trigger of a semiautomatic firearm using a
                bump-stock-type device with the non-trigger hand by ``pushing the
                firearm forward.'' In fact, the shooter ``pulls'' the trigger once and
                allows the firearm and attached bump-stock-type device to operate until
                the shooter releases the trigger finger or the constant forward
                pressure with the non-trigger hand. The non-trigger hand never comes in
                contact with the trigger and does not actuate, function, or pull it. By
                maintaining constant forward pressure, a shooter relies on the device
                to capture and direct recoil energy for each subsequent round and
                requires no further manipulation of the trigger itself.
                 In this way, the Department also disagrees that ``[r]ecoil is
                incidental to the firing sequence of a bump-stock type device equipped
                semiautomatic firearm, not intrinsic.'' Without recoil and the capture
                and directing of that recoil energy, a bump-stock-type device would be
                no different from a traditional shoulder stock. As numerous commenters
                acknowledged, bump-stock-type devices allow shooters to fire
                semiautomatic firearms at a faster rate and in a different manner than
                they could with traditional shoulder stocks. Bump-stock-type devices do
                this by capturing and directing recoil mechanically, enabling
                continuous fire without repeated manual manipulation of the trigger by
                a shooter.
                b. Bump-Stock-Type Device Firing Technique
                Comments Received
                 Thousands of commenters objected to the proposed rule on grounds
                that bump-stock-type devices are novelty items that assist with bump
                firing, which is a technique that any shooter can perform with training
                or with everyday items such as a rubber band or belt loop. Many
                commenters stated that all semiautomatic firearms can be bump fired by
                a shooter simply holding the trigger finger stationary and pushing the
                weapon forward until the trigger is depressed against it to the point
                of
                [[Page 66533]]
                firing, and that use of bump-stock-type devices makes using the bump-
                fire shooting technique safer for the shooter and those around the
                shooter. Some commenters also gave examples of extremely skilled and
                fast shooters who do not need any assistive device or item to fire a
                semiautomatic firearm at a rapid rate. Commenters therefore argued that
                if the Department proceeds to prohibit possession of bump-stock-type
                devices they must also ban rubber bands, belt loops, string, or even
                people's fingers.
                Department Response
                 The Department disagrees with commenters' assessments and believes
                that bump-stock-type devices are objectively different from items such
                as belt loops that are designed for a different primary purpose but can
                serve an incidental function of assisting with bump firing. To bump
                fire a firearm using a belt loop or a similar method without a bump-
                stock-type device, a shooter must put his thumb against the trigger and
                loop that thumb through a belt loop. With the non-trigger hand, the
                shooter then pushes the firearm forward until the thumb engages the
                trigger and the firearm fires. The recoil pushes the firearm backwards
                as the shooter controls the distance of the recoil, and the trigger
                resets. The constant forward pressure with the non-trigger hand pushes
                the firearm forward, again pulling the firearm forward, engaging the
                trigger, and firing a second round.
                 This rule defines the term ``automatically'' to mean ``functioning
                as the result of a self-acting or self-regulating mechanism.'' Bump-
                stock-type devices enable semiautomatic firearms to operate
                ``automatically'' because they serve as a self-acting or self-
                regulating mechanism. An item like a belt loop is not a ``self-acting
                or self-regulating mechanism.'' When such items are used for bump
                firing, no device is present to capture and direct the recoil energy;
                rather, the shooter must do so. Conversely, bump-stock-type devices are
                specifically designed to capture the recoil energy, a force that
                initiates a firing sequence that ultimately produces more than one
                shot. That firing sequence is ``automatic'' because the device
                harnesses the firearm's recoil energy as part of a continuous back-and-
                forth cycle that allows the shooter to attain continuous firing after a
                single pull of the trigger.
                 Bump firing utilizing a belt loop or similar method of maintaining
                tension on the firearm is thus more difficult than using a bump-stock-
                type device. In fact, the belt-loop method provides a stabilizing point
                for the trigger finger but relies on the shooter--not a device--to
                harness the recoil energy so that the trigger automatically re-engages
                by ``bumping'' the shooter's stationary trigger finger. Unlike a bump-
                stock-type device, the belt loop or a similar manual method requires
                the shooter to control the distance that the firearm recoils and the
                movement along the plane on which the firearm recoils.
                 ATF's previous bump-stock-type device classifications determined
                that these devices enable continuous firing by a single function of the
                trigger. Other firing techniques may do the same because they rely on a
                single ``pull.'' However, as ATF has made clear, a determining factor
                is whether the device operates or functions automatically. The proposed
                and final rules make clear that if a device incorporates a self-acting
                or self-regulating component for the firing cycle, the firearm equipped
                with the device operates automatically. Again, this differs from
                traditional semiautomatic firearms because the trigger must be
                repeatedly manipulated by the shooter to fire additional rounds,
                whereas a bump-stock-type device allows for a single pull, and the
                self-acting or self-regulating device automatically re-engages the
                trigger finger.
                 Further, while skilled shooters may be able to fire more rapidly
                than a shooter employing a bump-stock-type device on a semiautomatic
                firearm, they do so by pulling and releasing the trigger for each shot
                fired. This is a fundamental distinction between skilled shooters and
                those employing bump-stock-type devices. Bump-stock-type devices
                require that a shooter pull the trigger to fire the first round and
                merely maintain the requisite pressure to fire subsequent rounds. This
                is the purpose of a bump-stock-type device--to make rapid firing easier
                without the need to pull and release the trigger repeatedly. This shows
                that skilled shooters would be unaffected by the proposed rule and
                counters commenters' arguments that the rule is ``arbitrary and
                capricious'' on these grounds.
                11. Proposed Definitions
                a. Vagueness--Rate of Fire
                Comments Received
                 Many commenters focused on the increased rate of fire associated
                with bump-stock-type devices and objected to the proposed regulation
                being ``based, at least in part, on the idea that bump stocks are
                machineguns because they `allow[ ] ``rapid fire'' of the semiautomatic
                firearm,' `increase the rate of fire of semiautomatic firearms,' and
                `mimic automatic fire' '' (quoting 83 FR at 13443-44). Commenters
                objected to classifying bump-stock-type devices as machineguns because
                ``a high rate of fire alone does not transform a semi-automatic into an
                automatic weapon under the NFA.''
                 Additionally, other commenters objected to classifying other
                ``rate-increasing devices'' as machineguns because doing so would
                require a standard rate of fire to be defined, which some said is
                impossible, or would capture certain semiautomatic firearms and
                firearms accessories. A few commenters pointed out that ``[t]rue
                machine guns do not require freedom to oscillate fore and aft to
                increase their rate of fire. The rate of fire of a machine gun is
                intrinsic to the weapon and completely independent of the shooter's
                manual dexterity, the firing position, the number of hands holding the
                firearm, and any degree of freedom of motion. . . . Bump stocks do not
                increase the rate of fire when the semiautomatic firearm is operated
                with only one hand--even when shouldered. The human element is
                indispensable to any firing rate increase achieved with a bump stock.''
                Department Response
                 The Department has neither proposed the rate of fire as a factor in
                classifying machineguns, nor utilized this as the applicable standard
                in the proposed rule. The Department disagrees with any assertion that
                the rule is based upon the increased rate of fire. While bump-stock-
                type devices are intended to increase the rate at which a shooter may
                fire a semiautomatic firearm, this rule classifies these devices based
                upon the functioning of these devices under the statutory definition.
                The Department believes that bump-stock-type devices satisfy the
                statutory definition of ``machinegun'' because bump-stock-type devices
                utilize the recoil energy of the firearm to create an automatic firing
                sequence with a single pull of the trigger. The rate of fire is not
                relevant to this determination.
                 The Department also agrees with commenters that the standard rate
                of fire of a semiautomatic firearm or machinegun is a characteristic
                that is not dependent upon the individual shooter. Any reference to the
                ``increased'' rate of fire attributable to bump-stock-type devices
                refers only to the increased rate of fire that a particular shooter may
                achieve. Further, the Department agrees that there is no rate of fire
                that can identify or differentiate a machinegun from a semiautomatic
                firearm. This is because the statutory definition alone determines
                whether a firearm is a
                [[Page 66534]]
                machinegun. The Department believes that the final rule makes clear
                that a bump-stock-device will be classified as a machinegun based only
                upon whether the device satisfies the statutory definition.
                b. Vagueness--Impact on Semiautomatic Firearms and Other Firearm
                Accessories
                Comments Received
                 More than 56,000 commenters, including those submitting through the
                three main form letters opposing the rule and the NAGR submission,
                indicated that the proposed rule would set a dangerous precedent
                because a future ``anti-gun Administration'' will use it to confiscate
                millions of legally owned semiautomatic firearms as well as firearm
                components and accessories.
                 Commenters opposed to the rule broadly argued that by classifying
                bump-stock-type devices as machineguns, AR-15s and other semiautomatic
                firearms also may be classified as machineguns. In particular,
                commenters stated that under the GCA, rifles and shotguns are defined
                using a ``single pull of the trigger'' standard, in contrast to
                machineguns, which are defined by a ``single function of the trigger''
                standard under the NFA. Commenters argued that by defining ``single
                function of the trigger'' to mean ``single pull of the trigger,'' the
                rule will bring all semiautomatic rifles and shotguns currently
                regulated under the GCA under the purview of the NFA. Commenters also
                argued that the proposed regulatory text encompasses a number of
                commercially available items, such as Gatling guns, competition
                triggers, binary triggers, Hellfire trigger mechanisms, or even drop-in
                replacement triggers. One commenter pointed out that the language
                ``firing without additional physical manipulation of the trigger by
                shooter'' would apply, for instance, to Model 37 pump shotguns made by
                Ithaca.
                 Several commenters said that the proposed rule should be more
                narrowly tailored so that it applies to bump-stock-type devices only.
                For instance, one commenter proposed that the following be added to the
                definition of bump-stock-type device: ``A single accessory capable of
                performing the roles of both a pistol grip and a shoulder stock.''
                Another commenter suggested that, at most, one sentence could be added
                at the end of the definition of ``machinegun'':
                 For purposes of this definition, the term ``automatically'' as
                it modifies ``shoots, is designed to shoot, or can be readily
                restored to shoot,'' means a device that--(1) attaches to a
                semiautomatic rifle (as defined in section 921(a)(28) of title 18,
                United States Code); (2) is designed and intended to repeatedly
                activate the trigger without the deliberate and volitional act of
                the user pulling the trigger each time the firearm is fired; and (3)
                functions by continuous forward pressure applied to the rifle's fore
                end in conjunction with a linear forward and backward sliding motion
                of the mechanism utilizing the recoil energy when the rifle is
                discharged.
                One commenter suggested that, instead of trying to define a bump-stock-
                type device, it would be better to issue a rule stating that one cannot
                modify or replace the current style of stock with one that contains
                other features, with exceptions for adjusting the length of the stock
                or having a cheek rest.
                Department Response
                 The Department disagrees that other firearms or devices, such as
                rifles, shotguns, and binary triggers, will be reclassified as
                machineguns under this rule. Although rifles and shotguns are defined
                using the term ``single pull of the trigger,'' 18 U.S.C. 921(a)(5),
                (7), the statutory definition of ``machinegun'' also requires that the
                firearm ``shoots automatically more than one shot, without manual
                reloading,'' by a single function of the trigger, 26 U.S.C. 5845(b).
                While semiautomatic firearms may shoot one round when the trigger is
                pulled, the shooter must release the trigger before another round is
                fired. Even if this release results in a second shot being fired, it is
                as the result of a separate function of the trigger. This is also the
                reason that binary triggers cannot be classified as ``machineguns''
                under the rule--one function of the trigger results in the firing of
                only one round. By contrast, a bump-stock-type device utilizes the
                recoil energy of the firearm itself to create an automatic firing
                sequence with a single pull of the trigger. The Department notes that
                ATF has already described a ``single pull of the trigger'' as a
                ``single function of the trigger.'' See ATF Ruling 2006-2.
                 Further, while the phrase ``firing without additional physical
                manipulation of the trigger by the shooter'' would apply to firearms
                like the Model 37 pump shotguns made by Ithaca, that firearm could not
                be classified as a machinegun under the rule. The Model 37 permits a
                shooter to pull the trigger, hold it back, and pump the fore-end. The
                pump-action ejects the spent shell and loads a new shell that fires as
                soon as it is loaded. While this operates by a single function of the
                trigger, it does not shoot ``automatically,'' and certainly does not
                shoot ``without manual reloading.'' 26 U.S.C. 5845(b). In fact, the
                pump-action design requires that the shooter take action to manually
                load the firearm for each shot fired.
                 The Department disagrees that ``automatically'' should be defined
                using the more extensive definition quoted above. Whereas analysis as
                to what constitutes a ``single function of the trigger'' is separate
                from whether a firearm shoots automatically, the commenter's proposed
                definition merges the two issues. The Department believes that this may
                lead to confusion, further complicate the issue, and result in further
                questions that require clarification.
                c. Concerns Raised by Equating ``Function'' and ``Pull''
                Comments Received
                 One commenter said drafters of the NFA chose the term ``function''
                intentionally and that by proposing to equate ``function'' with
                ``pull,'' a whole new fully automatic non-machinegun market will be
                opened because ``fire initiated by voice command, electronic switch,
                swipe on a touchscreen or pad, or any conceivable number of interfaces
                [does] not requir[e] a pull.'' The commenter suggested that ``single
                function of a trigger'' be defined to include but not be limited to a
                pull, as that would include bump-stock-type devices without opening a
                ``can of worms.''
                Department Response
                 The proposed addition to the regulatory definition of machinegun
                includes this statement: ``For purposes of this definition, the term
                `single function of the trigger' means a `single pull of the trigger.'
                '' The Department believes that the commenter is correct--this proposed
                definition may lead to confusion. The proposed definition suggests that
                only a single pull of the trigger will qualify as a single function.
                However, it is clear that a push or other method of initiating the
                firing cycle must also be considered a ``single function of the
                trigger.'' Machineguns such as the M134 Minigun utilize a button or an
                electric switch as the trigger. See 83 FR at 13447 n.8 (explaining that
                other methods of trigger activation are analogous to pulling a
                trigger).
                 Therefore, the Department concurs with the commenters and has
                modified the proposed definition so that in this final rule the
                regulatory text will state that ``single function of the trigger''
                means a ``single pull of the trigger'' and analogous motions rather
                than a ``single pull of the trigger.'' Although the case law
                establishes that a ``single pull'' is a
                [[Page 66535]]
                ``single function,'' those cases were addressing devices that relied on
                a single pull of the trigger, as opposed to some other single motion to
                activate the trigger. The term ``single function'' is reasonably
                interpreted to also include other analogous methods of trigger
                activation.
                E. ATF Suggested Alternatives
                1. General Adequacy of ATF Alternatives
                Comments Received
                 One commenter opposed to the rule suggested that the alternatives
                discussed in the NPRM were not in compliance with Office of Management
                and Budget (OMB) Circular A-4 guidance, and that ATF failed to consider
                available alternatives and the impact on innovation. In addition, the
                commenter stated that ATF failed to show a need for the rule and argued
                that ATF did not make a good-faith attempt to meet its statutory
                mandate to identify, analyze, and rule out feasible alternatives. One
                commenter suggested that the analysis of alternatives should include
                alternatives provided under OMB Circular A-4, which include tort
                liability, criminal statutes, and punishments for violating statutes.
                Department Response
                 OMB Circular A-4 requires the consideration of ``possible
                alternatives'' to regulation.\8\ ATF considered possible alternatives
                that it could legally employ under the NFA, as many of the suggested
                alternatives from commenters--e.g., grandfathering and reimbursement
                policies--are not possible given the legal constraints of existing ATF
                authority. OMB Circular A-4 stipulates, ``The number and choice of
                alternatives selected for detailed analysis is a matter of judgment.
                There must be some balance between thoroughness and the practical
                limits on [the agency's] analytical capacity.'' \9\ Circular A-4 adds
                that ``analyzing all possible combinations is not practical when there
                are many options (including possible interaction effects).'' \10\ In
                these cases, the agency is to use its judgment to choose reasonable
                alternatives for careful consideration. During formulation of the NPRM,
                ATF considered various alternatives, including examples provided under
                OMB Circular A-4, and deemed them inappropriate. ATF believes that
                bump-stock-type devices satisfy the definition of ``machinegun'' under
                the NFA, so regulatory action is necessary to implement the NFA and
                GCA.
                ---------------------------------------------------------------------------
                 \8\ OMB Circular A-4, Regulatory Analysis, at 2 (Sept. 17,
                2003), https://www.whitehouse.gov/sites/whitehouse.gov/files/omb/circulars/A4/a-4.pdf.
                 \9\ Id. at 7.
                 \10\ Id. at 11.
                ---------------------------------------------------------------------------
                2. First ATF Alternative--No Regulatory Action
                Comments Received
                 Commenters opposed to the regulation implicitly agreed with the
                first alternative listed by ATF, which is for the Department not to
                take any action. They argued that attention should be devoted to
                improving the background check system, that ATF should concentrate on
                enforcing the existing gun laws, or that if there is to be change, that
                change should be made by Congress or the States. One commenter argued
                ATF failed to properly analyze this alternative.
                Department Response
                 As explained above, Part IV.D.4, the Department has concluded that
                the NFA and GCA require regulation of bump-stock-type devices as
                machineguns, and that taking no regulatory action is therefore not a
                viable alternative to this rule.
                3. Second ATF Alternative--Shooting Ranges
                Comments Received
                 Commenters who suggested that bump-stock-type devices be used in a
                controlled setting, or be available only at shooting ranges, were
                largely in support of the rule rather than viewing it as a complete
                alternative to taking no regulatory action.
                Department Response
                 The Department acknowledges comments on the potential use of bump-
                stock-type devices in a controlled setting, such as a shooting range.
                As stated above, the Department believes that such items satisfy the
                statutory definition of ``machinegun,'' and therefore it is
                promulgating this rule to clarify the definition. ATF has previously
                held that the on-premises rental of NFA firearms is permitted. However,
                whereas machineguns that are currently available for rental at shooting
                ranges are lawfully registered in the NFRTR if they may be lawfully
                possessed under 18 U.S.C. 922(o)(2)(B), bump-stock-type devices cannot
                be registered because none were in existence when section 922(o) was
                enacted in 1986.
                4. Third ATF Alternative--Use Other Means
                Comments Received
                 Many commenters opposed to the rulemaking pointed out that bump
                firing can be accomplished by using other everyday items such as belt
                loops or rubber bands. See Part IV.10.b. No commenter said that solely
                using rubber bands or other items would be a satisfactory alternative
                if the proposed rule went into effect. Rather, these commenters made
                the point that if bump firing is possible with or without bump-stock-
                type devices, then the Department would be obliged to also prohibit
                possession of rubber bands and belt loops under the NFA.
                Department Response
                 The Department has detailed in the NPRM and this rule the
                distinction between bump firing with a bump-stock-type device and using
                belt loops or rubber bands. See Part IV.10.b. Although a shooter using
                a belt loop, string, or other manual method utilizes recoil energy to
                bump fire, the shooter is responsible for constraining the firearm,
                maintaining the correct finger pressure, and regulating the force
                necessary to fire continuously. This is clearly distinguishable from a
                bump-stock-type device, as ATF has explained that such a device
                functions ``as a self-acting and self-regulating force that channels
                the firearm's recoil energy in a continuous back-and-forth cycle that
                allows the shooter to attain continuous firing after a single pull of
                the trigger so long as the trigger finger remains stationary on the
                device's extension ledge.'' 83 FR at 13443. Based on the clear
                differences between bump-stock-type devices and manual means of bump
                firing, the Department disagrees with the commenters that manual means
                of bump firing are factually or technically equivalent to bump-stock-
                type devices.
                F. Other Alternatives
                1. Allow Registration or Grandfathering of Bump-Stock-Type Devices
                Under NFA
                Comments Received
                 Several hundred commenters argued that ATF should announce an
                amnesty period, allowing time for current owners of bump-stock-type
                devices to register them as NFA firearms in the NFRTR. These commenters
                argued that pursuant to section 207(d) of the GCA, the Attorney General
                has power to establish amnesty periods for up to 90 days. Further, they
                argued there is precedent for an amnesty period, pointing to the seven-
                year amnesty/registration period that was allowed for the Striker-12/
                Streetsweeper and USAS-12 shotguns. See ATF Rulings 94-1, 94-2. Doing
                so, they argued, would save the Government from having to compensate
                [[Page 66536]]
                current owners of bump-stock-type devices and also even generate money
                for the Government, as individuals would be required to pay a $200 tax
                on the devices. See 26 U.S.C. 5821.
                Department Response
                 The Department disagrees that an amnesty period is possible in this
                scenario. While in 1968 Congress left open the possibility of future
                amnesty registration of firearms subject to the NFA, ATF has long held
                that it eliminated any possible amnesty for machineguns in 1986.
                Following passage of 18 U.S.C. 922(o), ATF advised the industry and the
                public that amnesty registration of machineguns was not legally
                permissible. For example, in 1996 and 1997, ATF advised an industry
                member that:
                18 U.S.C. 922(o) would preclude the registration of machineguns
                during an amnesty period. Section 922(o) prohibits possession of
                machineguns which were not lawfully possessed prior to its effective
                date of May 19, 1986 . . . . Since 922(o) [was enacted after the
                amnesty provision of the NFA], its provisions would prevail over any
                earlier enactment in conflict. This means that any future amnesty
                period could not permit the lawful possession and registration of
                machineguns prohibited by section 922(o).
                Letter for C. Michael Shyne from ATF's National Firearms Act Branch
                Chief (March 10, 1997). Section 922(o) does not ban the private
                possession and transfer of all machineguns because it specifically
                excludes ``any lawful transfer or lawful possession of a machinegun
                that was lawfully possessed before the date [section 922(o)] takes
                effect.'' 18 U.S.C. 922(o)(2)(B). The intent of the statute was to
                limit transactions in post-1986 machineguns. See United States v.
                Ferguson, 788 F. Supp. 580, 581 (D.D.C. 1992) (``Under section
                922(o)(2)(B), certain machineguns, namely, those that were lawfully
                possessed before enactment of the statute in 1986, may be legally
                possessed and transferred even today.''); see also United States v.
                O'Mara, 827 F. Supp. 1468, 1470 n.4 (C.D. Cal. 1993) (citing Ferguson).
                Congress's goal was to ban the transfer and possession of such weapons
                outright. United States v. Hunter, 843 F. Supp. 235, 247-48 (E.D. Mich.
                1994). The legislative history supports this proposition. When asked
                whether an amnesty period could ``be administratively declared by the
                Secretary of the Treasury by the enactment of this bill,'' Senator
                Kennedy responded that ``[t]here is nothing in the bill that gives such
                an authority, and there is clearly no valid law enforcement goal to be
                achieved by such open-ended amnesty.'' See id. at 248.
                 Some commenters pointed to ATF Rulings 94-1 and 94-2 as precedent
                for an amnesty period; however, section 922(o) applies only to
                machineguns, and there was no similar restriction on the destructive
                devices at issue in ATF Rulings 94-1 and 94-2. Therefore, these rulings
                cannot serve as precedent in the present case.
                2. Licensing and Background Checks
                Comments Received
                 Numerous commenters suggested other methods for how bump-stock-type
                devices should be regulated, including methods involving background
                checks. Some commenters broadly suggested that these devices should be
                sold like firearms under the GCA, meaning that the purchaser would
                undergo a background check when acquiring one from a retailer. One
                commenter suggested a new ``2.5 firearms class'' that would cover
                ``grey area'' guns and accessories, like bump-stock-type devices.
                Possessors of items falling under the ``2.5 firearms class'' would
                undergo background checks and, as with State-issued concealed-carry
                permits, local law enforcement would be able to cancel privileges if
                necessary. Other commenters suggested that bump-stock-type devices
                should not be available to the public unless the possessor is licensed,
                passes a background check, or provides a valid reason for needing a
                bump-stock-type device. Another commenter suggested bump-stock-type
                devices should be regulated like ``any other weapon'' under the NFA, 26
                U.S.C. 5845(e), so that current owners could register them by paying a
                $5 fee, allowing a waiting period to elapse, and establishing a paper
                trail of ownership.
                Department Response
                 The Department acknowledges these suggested alternatives but does
                not have the authority to add a new class of firearms to the statutory
                scheme or impose licensing requirements to acquire a firearm. Such
                changes would require legislation. Further, the definition of ``any
                other weapon'' in the NFA does not apply to bump-stock-type devices.
                Because bump-stock-type devices are properly classified as
                ``machineguns'' under the NFA and GCA, the Department believes that ATF
                must regulate them as such, and that the recommended alternatives are
                not possible unless Congress amends the NFA and GCA.
                3. Remuneration
                Comments Received
                 Over 1,000 commenters opposed to the rule argued that compensation
                should be provided to owners of bump-stock-type devices. Several
                supporters of the rule also suggested there should be a buy-back
                program in order to reduce the number of bump-stock-type devices. One
                commenter more specifically stated that manufacturers or retailers
                should be required to buy back all such devices and make full refunds
                to all purchasers. Another supporter suggested a one-time tax credit to
                owners who surrender their bump-stock-type devices or provide proof of
                destruction.
                Department Response
                 The Department acknowledges comments on compensation for current
                owners of bump-stock-type devices. While ATF has the authority to
                implement the NFA and GCA, the Department does not have the necessary
                Federal appropriations to implement a buy-back program or offer
                monetary compensation. To implement a buy-back program or provide a tax
                credit would require congressional action.
                4. Medical Exemption
                Comments Received
                 Some commenters suggested that Department amend the proposed rule
                so it would provide an exemption for ``medical necessity,'' thereby
                allowing certain individuals, such as those with nerve damage or one
                functional arm, to possess bump-stock-type devices. Similarly,
                commenters suggested bump-stock-type devices should only be available
                for people who are physically unable to pull a trigger for hunting or
                target practice.
                Department Response
                 The Department does not have authority to create a medical
                exemption for the possession of machineguns. Pursuant to the NFA and
                GCA, for private possession of machineguns to be lawful, they must have
                been lawfully possessed before the effective date of 18 U.S.C. 922(o).
                5. Allow Removal of Trigger Ledge
                Comments Received
                 One commenter suggested that ``ATF could find that bump-stock-type
                devices with the ledge/rest removed are not affected by any additional
                regulation.'' The commenter argued that this would make the proposed
                rule ``logically consistent with the notion that operators may `bump
                fire' with or without a
                [[Page 66537]]
                bump-stock-type device, as long as they do not utilize a device
                allowing a fixed trigger finger.''
                Department Response
                 The Department does not believe that removing the trigger ledge is
                sufficient to affect a bump-stock-type device's classification as a
                machinegun. While the trigger ledge makes it easier to utilize the
                device, removing the ledge does nothing to prevent the directing of the
                ``recoil energy of the discharged rounds into the space created by the
                sliding stock (approximately 1.5 inches) in constrained linear rearward
                and forward paths.'' 83 FR at 13443. Therefore, even without the
                trigger ledge, the bump-stock-type device will operate as designed if
                the shooter simply holds his or her finger in place. As such the bump-
                stock-type device remains a ``machinegun'' under the NFA and GCA.
                6. Miscellaneous Alternatives To Regulate Bump-Stock-Type Devices
                Comments Received
                 Other miscellaneous comments included suggesting a ban only on
                future production and commercial sale of such items; enacting a quota
                on the number of devices that can be produced or possessed; enacting a
                Pigouvian tax, which is a tax imposed on a good that is calculated to
                reduce market quantity (and increase market price) in order to achieve
                the socially optimal level of the good; deferring action until Congress
                takes action; leaving the matter for State legislative action;
                improving security at mass-attended events; and improving law
                enforcement capabilities.
                Department Response
                 The Department acknowledges comments on alternative suggestions for
                the regulation of bump-stock-type devices, but it does not have
                authority to implement many of the suggested alternatives. The
                Department does not have the authority to restrict only the future
                manufacture or sale of bump-stock-type devices, nor does it have the
                authority to remove the general prohibition on the transfer and
                possession of machineguns that were not lawfully possessed on the
                effective date of 18 U.S.C. 922(o). In addition, the Department lacks
                the authority to enact an excise tax on bump-stock-type devices.
                 As mentioned above, the Department does not agree with commenters
                that any change needs to be enacted by Congress or should be left to
                State legislatures. Congress passed both the NFA and GCA, delegating
                enforcement authority to the Attorney General. Accordingly, the
                Attorney General has the authority to promulgate regulations necessary
                to enforce the provisions of the NFA and GCA, and the Department
                determined that notice-and-comment rulemaking was the appropriate
                avenue to clarify the definition of ``machinegun.'' In the interest of
                public safety and in light of the statutory definition of
                ``machinegun,'' the Department has determined that Federal regulation
                of bump-stock-type devices is necessary. However, this action does not
                prevent Congress from taking action on bump-stock-type devices in the
                future.
                 The Department acknowledges comments on improving security at mass-
                attended events and agrees that it is important to improve law
                enforcement capabilities. The Department actively works with State and
                local law enforcement agencies to provide security at mass-attended
                events, as well as training and equipment for their departments.
                G. Proposed Rule's Statutory and Executive Order Review
                Comments Received
                 A few commenters suggested that ATF failed to comply with Executive
                Orders 12866, 13563, and 13771, including failing to identify and
                repeal two regulations for every new regulation issued. Commenters
                argued that ATF did not quantify the benefits of the rule, and it did
                not explain why those benefits were unquantifiable as required by OMB
                Circular A-4. Commenters stated that ATF did not identify the need for
                the proposed rule, in that ATF cited no evidence to support that the
                Las Vegas shooter used a bump-stock-type device. One commenter asked
                that ATF demonstrate how the cost-benefit analysis shows that the
                proposed rule is in the interests of gun owners, business owners, and
                the Federal Government. The commenter further suggested that ATF did
                not provide any citations or peer-reviewed research as evidence of the
                need for Federal regulatory action. Lastly, some commenters questioned
                how ATF determined the negative externalities that were presented in
                the NPRM.
                Department Response
                 Executive Order 12866 and OMB Circular A-4 acknowledge that
                regulatory agencies should comply with them wherever possible or
                feasible. The Department interprets and adheres to the existing
                Executive Orders and OMB Circular A-4 to the extent that it is
                possible, using the best available information, and to the extent
                quantified information was available. Alternatively, wherever
                quantifiable means were not available, the Department considered
                qualitative costs, benefits, concerns, and justifications.
                 This rule is a significant regulatory action that clarifies the
                statutory definition of machinegun. By clarifying that bump-stock-type
                devices are machineguns subject to the restrictions of the NFA and GCA,
                the rule in effect removes those devices from the civilian marketplace.
                This final rule is an Executive Order 13771 regulatory action. See OMB,
                Guidance Implementing Executive Order 13771, Titled ``Reducing
                Regulation and Controlling Regulatory Costs'' (Apr. 55, 2017).
                As for the need for Federal regulation, agencies are allowed to
                consider public safety as a compelling need for a Federal rulemaking.
                Executive Order 12866 expressly recognizes as appropriate exercises of
                agency rulemaking authority that ``are made necessary by compelling
                public need, such as material failures of private markets to protect or
                improve the health and safety of the public, the environment, or the
                well-being of the American people.'' 58 FR 51735 (Oct. 4, 1993). As
                explained in the NPRM, the purpose of this rule is to amend ATF
                regulations to clarify that bump-stock-type devices are ``machineguns''
                as defined by the NFA and GCA, with a desired outcome of increasing
                public safety. In accordance with OMB Circular A-4, the Department has
                provided information wherever possible regarding the costs, benefits,
                and justification of this rule.
                 As further requested by one commenter, this rule not only considers
                the implications of this rule on gun owners in the United States,
                business owners, and the Federal Government, but also considers the
                risk of criminal use of bump-stock-type devices and the general safety
                of the public to justify the issuance of this final rule.
                H. Affected Population
                Comments Received
                 There were a number of commenters who stated this rule will affect
                between 200,000 and 500,000 owners. Some commenters suggested that the
                estimated number of bump-stock-type devices should be higher,
                potentially over a million, than the estimated amount stated in the
                NPRM. Some commenters indicated that this would incorporate homemade
                devices, 3D-printed devices, or other devices made by personal means.
                [[Page 66538]]
                Department Response
                 In the NPRM, ATF did not estimate the number of owners. 83 FR at
                13449. The 280,000-520,000 range in the Executive Order 12866 section
                of the NPRM is the estimated number of bump-stock-type devices in
                circulation, not the number of owners. While the Department does not
                know the total number of bump-stock-type devices currently extant, nor
                the number of owners, the Department's high estimate of 520,000 is
                still the primary estimate only for devices sold on the market. While
                it may be possible to make homemade devices, the Department cannot
                calculate the number of such devices or the likelihood of these devices
                circulating among the public. The Department is using the best
                available information, and there is no known information that would
                allow ATF to estimate such a number, much less achieve the level of
                accuracy that the public is requesting. Therefore, the estimates
                provided continue to be based upon the best available information.
                I. Costs and Benefits
                1. Costs to Purchasers
                Comments Received
                 One commenter stated that some models of bump-stock-type devices
                never sold for less than $425 plus taxes. Another commenter stated that
                the Department's regulatory analysis did not account for the individual
                cost in purchasing bump-stock-type devices, only manufacturers' and
                retailers' expenses. Other commenters suggested that the analysis did
                not account for taxes. One commenter suggested that the costs should
                incorporate the cost of purchasing a pre-1986 machinegun. One commenter
                suggested that many owners have bump-stock-type devices as the only
                stocks that they own and that purchasing a standard stock will need to
                be incorporated into the analysis.
                 Some commenters stated that the cost analysis does not include
                compensation for bump-stock-type devices and that the cost could be
                more than $50 trillion. Other commenters indicated that the rule did
                not account for lost lives, treatment costs, decreased tourism, and
                costs of criminal investigations. Other commenters argued that ATF
                failed to consider other costs, such as loss of faith in ATF by the
                regulated industry and resentment for not being reimbursed for bump-
                stock-type devices.
                Department Response
                 The Department concurs that certain models sold at the $425.95 rate
                (a rate also included in ATF's range of costs published in the NPRM),
                representing the high end of the range of rates. 83 FR at 13451.
                However, bump-stock-type devices also sold for as low as $100. Id. In
                order to account for the full range of prices, the Department used the
                average of the full range of prices; therefore, the average price of
                $301 was used in the NPRM to account for the full range of market
                prices for these bump-stock-type devices. Id. As for the payment of
                taxes, the Department concurs that an unknown number of bump-stock-
                type-devices were sold, and individuals paid local taxes on them at
                time of purchase. For the purposes of this final rule, the Department
                maintains the average price used in the NPRM but incorporates the
                average cost of combined State and local taxes. For the purposes of
                this final rule, the Department estimates that the national average of
                taxes is 6.47% and attributed this tax rate to the price of all bump-
                stock-type devices that were sold on the market.\11\
                ---------------------------------------------------------------------------
                 \11\ See Jared Walczak & Scott Drenkard, State and Local Tax
                Rates in 2017, Tax Found. (Jan. 31, 2017), https://taxfoundation.org/state-and-local-sales-tax-rates-in-2017/.
                ---------------------------------------------------------------------------
                 The Department disagrees that the regulatory analysis did not
                account for the individual cost in purchasing bump-stock-type devices.
                The market price of bump-stock-type devices sold to the public
                represents the public price of these devices, which also accounts for
                the manufacturer and retail prices and does not double-count costs.
                While it may be possible for the public to purchase a pre-1986
                machinegun, these amounts are not used to purchase bump-stock-type
                devices, so the market prices for these pre-1986 machineguns are not
                considered for purposes of this rule.
                 The Department reached out to the commenter who discussed the
                population of gun owners who will need to replace their bump-stock-type
                devices with standard stocks. The commenter was unable to provide a
                source establishing the existence of such gun owners and only
                speculated that this was a possibility. Having determined that this was
                speculation, the Department declined to incorporate this information
                into the analysis.
                 The Department does not propose compensation for bump-stock-type
                devices, so these costs were not included in the rule. See Part
                IV.D.1.b for a discussion of the Fifth Amendment's Takings Clause.
                Further, costs associated with victims, criminal investigations, loss
                of tourism, loss of faith in ATF by the regulated industry, and
                resentment for not being reimbursed for bump-stock-type devices are all
                indirect or unquantifiable costs of the rule and are not considered in
                the cost-benefit analysis.
                2. Costs to Manufacturers, Employees, and Communities
                Comments Received
                 Commenters suggested that this rule will cost manufacturers,
                employees, and families of manufacturers their livelihood. In
                particular, one commenter suggested that three additional manufacturers
                would have entered or re-entered the market after the lapse of the
                patent for the main manufacturer of bump-stock-type devices.
                Additionally, public comments suggested that the Department overlooked
                the capital expenses required to start a company.
                Department Response
                 The Department has considered the effect that this rule will have
                on these manufacturers, employees, and families and acknowledges that
                they will no longer be able to manufacture bump-stock-type devices. The
                Department acknowledges that there will be a potential loss of wages
                from employees losing jobs from loss of manufacturing; however, the
                extent to which they are unable to find replacement jobs is
                speculative. The Department considered the capital expenses for
                manufacturers, including patents and equipment to start production.
                However, in light of the Las Vegas shooting and the estimated time it
                would have taken for the patents to expire, the Department has
                determined that there could be potential crowding of additional
                manufacturers and saturation of the market for bump-stock-type devices.
                Therefore, the viability of these businesses is speculative and the
                capital expenses that they incurred are a sunk cost for those who put
                in the expense. While the Department does not include capital expenses
                for manufacturing in the economic analysis, the Department had already
                considered the overall potential for return on investment for any
                manufacturers who would have remained in the market from the existing
                estimate of foregone production. Accounting for capital expenses would
                be double counting of expenditures. Therefore, the economic analysis
                for this portion remains the same.
                3. Costs of Litigation
                Comments Received
                 Commenters suggested that the Department did not account for the
                cost of litigation regarding the rule.
                [[Page 66539]]
                Department Response
                 Litigation costs are not a direct cost of the rule because such
                costs do not result from compliance with the rule. Additionally, any
                estimate of litigation expenses would be highly speculative and would
                not inform the Department's decision regarding the implementation of
                this final rule. However, the Department acknowledges that to the
                extent parties choose to enter into litigation regarding this final
                rule, there are indirect costs associated with that litigation.
                4. Government Costs
                Comments Received
                 Commenters suggested that this rule would cost the Government
                approximately $297 million, including the disposal cost of the bump-
                stock-type devices. Other commenters indicated that confiscation costs
                were not included in the cost of the rule. One commenter provided
                estimates on the cost to house bump-stock-type device owners in prison
                as felons, particularly if a large number of owners opt not to destroy
                such devices. Lastly, one commenter suggested that ATF consider
                foregone sales taxes associated with ammunition used to fire bump-
                stock-type devices.
                Department Response
                 In the NPRM, the Department estimated that the total cost of the
                rule for the general public (e.g., owners and manufacturers of bump-
                stock-type devices) would be about $326.2 million over a 10-year
                period, not that the rule would cost the Federal Government that
                amount. 83 FR at 13454. The Department's estimate that Government costs
                are de minimis still stands for this final rule because the costs
                identified by these commenters are not Government expenditures.
                Further, costs associated with administering the option of current
                possessors of bump-stock-type devices abandoning their devices at their
                local ATF offices will be de minimis. The Department also disagrees
                that this rule will turn owners of bump-stock-type devices into felons.
                This final rule provides an effective date that allows ample time for
                current owners to destroy or abandon such devices. To the extent that
                owners timely destroy or abandon these bump-stock-type devices, they
                will not be in violation of the law or incarcerated as a result.
                However, if prohibited bump-stock-type devices are possessed after the
                effective date of the final rule, the person in possession of the bump-
                stock-type device will be in violation of Federal law.
                 While the usage of bump-stock-type devices may boost ammunition
                sales, the Department did not consider the loss of tax revenue
                collected from additional ammunition sales because they are speculative
                and are not a direct cost of the rule. Additionally, any estimate of
                tax revenue generated would not inform the Department's decision
                regarding the implementation of this final rule.
                5. Benefits
                Comments Received
                 Commenters stated that there are no quantifiable benefits to
                justify the costs of this rule, nor will it prevent criminal use of
                firearms. One commenter also stated that ATF did not explain why the
                benefits were unquantifiable as required by OMB Circular A-4. Some
                commenters suggested that ATF is required ``by law'' to quantify and
                monetize benefits. Commenters stated that the benefits do not outweigh
                the costs and ATF failed to conduct any analysis of the benefits of the
                rule and did not quantify the benefits. Further, commenters argued that
                ATF did not substantiate its assertion that bump-stock-type devices
                will be used more frequently in future crimes if this rule is not
                promulgated.
                 One commenter argued that the Department needed to separate the
                effects of using a bump-stock-type device from other factors that might
                have incremental effects on criminal activity, such as crowd density
                and angle of fire. The commenter stated that benefits must be reduced
                accordingly and must take into account a reduction in violence instead
                of elimination of the threat of violence from bump-stock-type devices.
                Many commenters argued that ATF cannot rely on the Las Vegas shooting
                as the measure of benefits for this rule.
                 Commenters discussed means of monetizing shooting incidents or
                comparing the death rates related to other items like motor vehicles,
                opiates, knives, and rocks. Other commenters in support of the rule
                suggested that ATF incorporate the financial and societal benefits of
                this rule.
                Department Response
                 The Department declines to quantify benefits because OMB Circular
                A-4 requires quantifying and monetizing benefits only ``if possible.''
                OMB Circular A-4 at 45. One commenter provided descriptions on how to
                determine quantitative benefits of this rule and specifics on using a
                break-even analysis; however, due to limitations on data, the
                Department has considered the qualitative benefits for this rulemaking.
                 The Department did not account for the cost of deaths and injuries
                unrelated to bump-stock-type devices, as these are unrelated to this
                rule. This rule does not prohibit the use of firearms that could be
                used in shootings, or other items or devices. Furthermore, it is
                unclear how risk associated with other devices such as motor vehicles
                should influence ATF's decision-making. ATF has provided a cost-benefit
                analysis in both the NPRM and this final rule that fulfills the
                requirements of Executive Order 12866, OMB Circular A-4, the Regulatory
                Flexibility Act (RFA), and the Unfunded Mandates Reform Act.
                J. Regulatory Flexibility Act
                Comments Received
                 Some commenters suggested that the RFA requires examination of the
                future impact of the rule on innovation and of making a lawful product
                into an unlawful one.
                Department Response
                 The Department disagrees that the RFA requires an examination of
                those specific factors. The RFA ``requires agencies to consider the
                impact of their regulatory proposals on small entities, analyze
                effective alternatives that minimize small entity impacts, and make
                their analyses available for public comment.'' \12\ The RFA ``does not
                seek preferential treatment for small entities, nor does it require
                agencies to adopt regulations that impose the least burden on them, or
                mandate exemptions for them. Rather, it requires agencies to examine
                public policy issues using an analytical process that identifies
                barriers to small business competitiveness and seeks a level playing
                field for small entities, not an unfair advantage.'' \13\
                ---------------------------------------------------------------------------
                 \12\ U.S. Small Business Administration, Office of Advocacy, A
                Guide for Government Agencies: How to Comply with the Regulatory
                Flexibility Act, at 1 (Aug. 2017), https://www.sba.gov/sites/default/files/advocacy/How-to-Comply-with-the-RFA-WEB.pdf.
                 \13\ Id.
                ---------------------------------------------------------------------------
                 The Department found that this rule significantly impacts small
                businesses related to bump-stock-type devices. The Department
                interprets the RFA to mean that small businesses should not be
                prevented from using innovations to compete with other businesses, and
                to account for small businesses when determining alternative approaches
                with respect to small businesses in the field.\14\ At this time, there
                are only small businesses that manufacture bump-stock-type devices;
                therefore, no regulatory alternative was considered to
                [[Page 66540]]
                alleviate the regulatory burden on small businesses with respect to
                competition with businesses that are not small.
                ---------------------------------------------------------------------------
                 \14\ Id.
                ---------------------------------------------------------------------------
                K. Miscellaneous Comments
                 Commenters both in support of and in opposition to the proposed
                rule raised additional miscellaneous issues. These are discussed below.
                1. Improve Background Checks
                Comments Received
                 Separate from the suggested alternative, discussed above, that
                bump-stock-type devices be sold like firearms, many commenters voiced
                their general support for various enhancements to the existing Federal
                background check requirement. Commenters said the ``gun show loophole''
                should be closed, and many called for universal background checks. At
                least one commenter suggested there should be psychiatric evaluations
                for firearms purchasers. Commenters making these points were largely
                supporters of the proposed rule, but at least a few commenters opposed
                to the rule also supported background checks. One opposed commenter
                said better communication between the relevant government agencies and
                tighter background checks were needed. A few opposed commenters
                suggested it would be more effective to have a more in-depth background
                check along with a minimum age of 21 or 25 and a five-day waiting
                period because they observed that young, alienated people have
                frequently been the perpetrators of mass shootings.
                Department Response
                 The Department acknowledges comments on enhanced or expanded
                background checks, an increase in minimum age requirements, and waiting
                periods. The Department is aware of the importance of having accurate
                and complete information available to the NICS, which is managed by the
                FBI; further, the Department works with Federal and State agencies to
                ensure that necessary information is submitted to the system. The
                Department does not, however, have the authority to increase the
                minimum-age requirement or enact a mandatory waiting period to purchase
                a firearm.
                2. Increase Criminal Penalties
                Comments Received
                 Commenters on both sides of the issue suggested that there be more
                stringent criminal penalties for firearms offenses. Some commenters in
                support of the rule said there should be severe penalties for
                possessing a bump-stock-type device, or for manufacturing one through
                digital printing, or simply for anyone who manufactures or distributes
                bump-stock-type devices. Another commenter supporting the rule said
                that bump-stock-type devices should be prohibited from all public
                spaces where there is the potential for mass murder, but did not object
                to persons who wanted to use bump-stock-type devices on their own
                property or on hunting or shooting grounds. Some commenters opined that
                generally there should be more severe penalties for anyone using guns
                illegally or irresponsibly. A few commenters opposed to the rule
                suggested that in lieu of a rule prohibiting possession, a more
                effective deterrent would be severe penalties for the manufacture and
                sale of bump-stock-type devices, and that there should instead be swift
                and severe punishment, such as the death penalty for persons who commit
                or attempt to commit a mass shooting, or, more generally, that the law
                should be written to include mandated, nondiscretionary sentences.
                Department Response
                 The Department does not have the authority to increase criminal
                penalties. Only Congress can increase, amend, or add new criminal
                penalties for Federal crimes.
                3. Repeal the NFA and Hughes Amendment, and Remove Silencers
                Comments Received
                 Numerous commenters opposed to the regulation viewed the proposed
                rule as an infringement on their rights. As part of their opposition to
                the proposed rule, some commented that the NFA itself is inherently
                unconstitutional and declared that it should be repealed. Commenters
                similarly questioned the constitutionality of the Hughes Amendment (18
                U.S.C. 922(o)), which was enacted as a part of the Firearms Owners'
                Protection Act in 1986 and prohibits possession by individuals of any
                post-1986 machinegun. These commenters declared it should be repealed.
                A majority of these commenters simply objected to any further firearms
                restrictions and insisted these laws be repealed in order to restore
                freedoms they believe to have been steadily eroded by the Government.
                Some commenters noted that bump-stock-type devices evolved as a
                workaround to the NFA and Hughes Amendment restrictions so that
                shooters could have an affordable alternative to shoot in a manner that
                is close to a machinegun. Some opined that that a rule prohibiting
                bump-stock-type devices would be acceptable so long as these other
                restrictions are lifted to give individuals affordable access to
                machineguns. A few commenters also added that silencers should be
                removed from the NFA's coverage or be made available like any other
                firearm device, with at least one commenter stating that the Hearing
                Protection Act or Sportsmen's Heritage and Recreational Enhancement
                (SHARE) Act should be passed.
                Department Response
                 The Department does not have the authority to repeal or amend
                provisions of the NFA, such as by removing silencers from the NFA. The
                NFA is a statute, which only Congress may repeal or alter. ATF does not
                have the authority to remove the general prohibition on the transfer
                and possession of machineguns that were not lawfully possessed before
                the date 18 U.S.C. 922(o) became effective, nor does it have the
                authority to permit nongovernmental entities to possess machineguns or
                other NFA firearms that are not lawfully registered in the NFRTR. Only
                Congress can alter these provisions. However, as stated, ATF does have
                the authority to implement the existing statute and has utilized the
                rulemaking process to do so.
                4. Focus on Mental Health and Other Gun Control Measures
                Comments Received
                 Supporters argued that in addition to finalizing the rule, more
                attention needs to be paid to improving mental health care. Generally,
                these commenters suggested there should be more spending on the mental
                health system so as to increase access.
                 Numerous commenters in support of the rule also listed several
                other proposals pertaining to gun safety or gun control measures that
                should be implemented. Almost 5,000 commenters expressed that ``other
                conversion devices'' along with bump-stock-type devices should be
                banned. And more than 1,500 commenters also called for a ban on
                ``assault weapons'' or firearms altogether, while several others
                specifically stated that there should be restrictions on high-capacity
                magazines. Some commenters provided many other suggestions, including a
                higher age limit to acquire a firearm, written tests for firearm
                access, mandatory gun safety classes, proper storage inspections, a
                nationwide gun registry, licensure and gun ownership insurance
                requirements, ammunition limits, and protocols for removing firearms
                from domestic abusers and the mentally ill through protective orders.
                [[Page 66541]]
                Department Response
                 The Department acknowledges the importance of improving mental
                health care. However, mental health treatment does not fall under the
                Department's authority.
                 Although this rulemaking specifically addresses bump-stock-type
                devices, any item that meets the definition of a ``machinegun'' will be
                regulated as such and cannot be possessed unless legally registered.
                But only Congress can add additional requirements that must be met in
                order to purchase a firearm.
                 The Department does not have the authority to remove firearms from
                persons who are not prohibited from receiving or possessing them under
                Federal law. Only Congress can amend or add new categories of
                prohibited persons.
                L. Comments on the Rulemaking Process
                1. Availability of Supporting Documentation
                Comments Received
                 A handful of commenters argued that the procedures of the APA were
                not properly followed, in part because ATF did not include any
                supporting documentation on how it formulated its decision to regulate
                bump-stock-type devices. In particular, commenters stated that although
                they submitted Freedom of Information Act requests, ATF did not make
                available its own prior letter determinations that classified various
                bump-stock-type devices as firearm parts not subject to the NFA or GCA,
                nor did ATF make available any evidence suggesting that there have been
                other instances of criminal use of a bump-stock-type device. This kind
                of documentation, they argued, would provide the basis upon which the
                agency justified its proposed rule and therefore should be made public
                in order to allow for meaningful comment under the APA.
                Department Response
                 Contrary to the commenters' arguments, the Department believes that
                it provided all of the background information necessary to allow
                meaningful public participation. The APA, 5 U.S.C. 553(b), provides
                that ``[g]eneral notice of proposed rule making shall be published in
                the Federal Register,'' and that this notice shall include, inter alia,
                ``either the terms or substance of the proposed rule or a description
                of the subjects and issues involved.'' Federal courts have recognized
                that they must determine whether regulations are consistent with
                statutes, and ``whether the process used in arriving at those
                regulations afforded those affected . . . their procedural due. More
                specifically, in the informal rulemaking context . . . , this inquiry
                asks whether the agency gave `interested persons an opportunity to
                participate in the rule making through submission of written (or other)
                data' and whether it `incorporate(d) in the rule adopted a concise
                general statement of their basis and purpose.' '' Weyerhaeuser Co. v.
                Costle, 590 F.2d 1011, 1024 (D.C. Cir. 1978) (quoting 5 U.S.C. 553). A
                ``notice of proposed rulemaking must provide sufficient factual detail
                and rationale for the rule to permit interested parties to comment
                meaningfully.'' Honeywell Int'l, Inc. v. EPA, 372 F.3d 441, 445 (D.C.
                Cir. 2004) (internal quotation marks omitted).
                 The Department agrees with commenters that interested parties will
                not be able to make meaningful comments upon an agency's proposed
                regulation if the notice ``fails to provide an accurate picture'' of
                the agency's reasoning. Conn. Light & Power Co. v. NRC, 673 F.2d 525,
                528 (D.C. Cir. 1982). Commenters fail, however, to recognize that the
                text of the NPRM set out the facts necessary to ``provide an accurate
                picture'' of the Department's reasoning. In the NPRM, the Department
                articulated the reasons for its proposed change in the classification
                of bump-stock-type devices, provided detailed descriptions and
                explanations of its prior classifications, and offered thorough
                explanations of its past and current analysis. Accordingly, the
                Department believes that it provided notice to the public, in
                sufficient factual detail, to permit interested parties to comment
                meaningfully on the proposed rule.
                2. Previous ``Lack of Candor''
                Comments Received
                 One commenter also included an extensive description of ATF's
                ``prior lack of candor,'' including instances where ATF purportedly (1)
                committed ``institutional perjury'' before the courts in the context of
                criminal prosecutions and supporting probable-cause showings for search
                warrants; (2) committed deception and delayed responding with respect
                to congressional inquiries regarding NFRTR inaccuracies as well the
                ``Fast and Furious'' investigation; and (3) misled the public about the
                accuracy of the NFRTR. According to the commenter, these episodes
                highlight a pattern of procedural irregularities that should draw
                further scrutiny of this rulemaking.
                Department Response
                 These comments are beyond the scope of this rulemaking, but the
                Department notes that ATF has committed available resources to develop
                the NPRM and respond to comments as part of the rulemaking process. In
                developing this rulemaking and responding to comments, ATF has followed
                all established procedures and complied with all relevant policies and
                requirements.
                3. 90-Day Public Comment Period
                Comments Received
                 One commenter asserted that the agency failed to provide the
                statutorily mandated 90-day public comment period. The commenter relied
                on an online article that ``detail[ed] the trials and tribulations of
                trying to find the appropriate docket,'' given that some commenters
                indicated that they encountered a ``Comment Period Closed''
                notification on the FederalRegister.gov website when the NPRM was
                published on March 29, 2018. The author of the online article said that
                he submitted an inquiry to ATF asking why the comment period appeared
                closed when it should have been open through June 27, 2018, and why the
                website, at various times, depicted different numbers for the amount of
                comments ATF received. The author's description of events concluded by
                noting that he received a response from ATF with a specified weblink to
                Regulations.gov where he could submit a comment but that none of his
                comments submitted were visible on the website. Relying primarily on
                this online account, the commenter asserts that ATF did not disclose
                this weblink to the public and that numerous people believed that the
                comment period was closed from the very beginning of the comment period
                and were therefore precluded from submitting comments. The commenter
                therefore believes that the comment period should be extended because
                ATF did not permit the statutorily mandated 90-day comment period.
                Department Response
                 The Department acknowledges that upon publication of the NPRM on
                March 29, 2018, there was some confusion within the first 24 to 48
                hours about submitting comments through the Federal eRulemaking Portal
                (www.Regulations.gov), which is managed and maintained by a third-party
                host. ATF was in touch with the managers of the Federal eRulemaking
                portal, and relayed an explanation of these technical issues to the
                author of
                [[Page 66542]]
                the online article in two subsequent emails dated April 2 and April 3,
                2018. However, there is no evidence that the proposed rule was not
                available for public comment for the 90-day comment period. On the
                contrary, ATF received numerous comments from the very beginning of the
                comment period.
                 ATF explained to the author of the article that on March 29, 2018,
                when the comment period opened for the NPRM, the link for submitting
                comments to the NPRM had been inadvertently connected to the
                Regulations.gov Docket ID number 2018-0001-0001, which had been used by
                the Regulations.gov website for the ANPRM comment period, December 26,
                2017, through January 25, 2018. On March 29, 2018, the same day the
                proposed rule was published in the Federal Register, individuals were
                able to and did submit comments for the NPRM even though it was linked
                to the Docket ID used for the ANPRM. Realizing that the link for the
                NPRM should not have been listed under the ANPRM Docket ID, a new
                Docket ID number (2018-0002-0001) was created for the NPRM. These
                Docket ID numbers are created by the third-party managers of
                Regulations.gov for purposes of the website. ATF uses its own docket
                number, 2017R-22, as seen in the text of the ANPRM and NPRM.
                 Once the third-party managers of Regulations.gov created a new
                Docket ID number for the NPRM with a ``Comment Now'' feature, they
                eliminated the ability to submit NPRM comments under the old ANPRM
                Docket ID. The Department acknowledges that there was some confusion
                because there was a brief period on March 29, 2018, during which the
                ANPRM link (2018-0001-0001) was prominently situated on the homepage of
                the Regulations.gov website even though that link was no longer able to
                accept comments for the NPRM. Despite the brief prominence of the old
                ANPRM Docket ID on the Regulations.gov website, the public had the
                ability to submit comments through the Federal eRulemaking Portal for
                the NPRM at all times, as a simple search for ``bump stock'' in the
                main search bar on Regulations.gov during this time would have
                displayed the link for the new NPRM Docket ID, which was active and
                accepting comments. Moreover, some individuals confused about how to
                comment on Regulations.gov called ATF's Office of Regulatory Affairs,
                which was able to assist them.
                 ATF also responded to the author's inquiry regarding the
                discrepancy in the numbers showing the amount of comments received.
                Over the weekend of March 31, 2018, the third-party managers of
                Regulations.gov transferred all comments submitted for the NPRM through
                the ANPRM Docket ID to the new NPRM Docket ID. ATF was informed that
                the number of comments displayed on Regulations.gov updated only once a
                day and therefore would harmonize over the next few days as ongoing
                system maintenance occurred. Ultimately, the website depicting the
                amount of comments received reflects all comments received since March
                29, 2018, the beginning of the comment period.
                 To answer the author's inquiry as to why his comments submitted
                were not visible on Regulations.gov, ATF reminded the online author
                that Part VII.C of the NPRM, which described the three methods for
                submitting public comments, informed the public that comments submitted
                through Regulations.gov ``will be posted within a few days of being
                submitted. However, if large volumes of comments are being processed
                simultaneously, . . . comment[s] may not be viewable for up to several
                weeks.'' Since the beginning of the comment period, ATF received a high
                volume of comments and, as forewarned, there was a delay between the
                time comments were submitted and when they became viewable on the
                website, assuming the comment met the posting guidelines stated in Part
                VII.A of the NPRM. By April 3, 2018, two of the online author's
                comments were visible on Regulations.gov, and the agency provided him
                with direct weblinks to his comments.
                 Accordingly, the Department disagrees that the agency failed to
                provide the statutorily mandated 90-day public comment period.
                Moreover, the Department notes that the Federal eRulemaking Portal is
                one of the three methods available for the public to submit comments
                during the 90-day comment period. Therefore, the public also had the
                ability to submit comments via mail or facsimile during the entire 90-
                day period.
                 The Department believes the numerous examples provided by the
                commenter of cases in which Federal agencies extended comment periods
                are inapplicable to this rulemaking. The specific scenarios the
                commenter listed were apparently all the result of the lapse in
                government funding that occurred in October 2013. At that time,
                agencies were largely unstaffed, and insufficient personnel were
                available to process the comments. This rulemaking has not involved
                similar difficulties.
                4. Request for Public Hearing
                Comments Received
                 A few commenters requested a hearing pursuant to the NPRM because
                they want the opportunity to be heard before ATF prescribes any rule.
                One commenter stated that 18 U.S.C. 926(b) requires ATF to hold a
                public hearing when such is requested because the statute provides that
                the Attorney General ``shall afford interested parties opportunity for
                hearing, before prescribing . . . rules and regulations [under 18
                U.S.C. ch. 44].''
                Department Response
                 The Department is not persuaded that a public hearing is necessary
                or appropriate in connection with this rulemaking. The Department
                believes that a comprehensive public record has already been
                established through the comment process, which generated over 186,000
                comments, some of which included substantial discussions of the
                rulemaking. The Department does not believe that a public hearing would
                meaningfully add data or information germane to the examination of the
                merits of the proposal or would provide substantive factual information
                that would assist the Department in improving the rule in material
                ways. Furthermore, the Department believes that it has made changes to
                this rule and included clarifications in the preamble that address the
                important issues raised by parties who requested a hearing. In light of
                all the circumstances, a public hearing is unnecessary.
                 The Supreme Court has held that it is not necessary for an agency
                to hold a public hearing on a rulemaking simply because it receives a
                request for one. In both United States v. Allegheny-Ludlum Steel Corp.,
                406 U.S. 742 (1972), and United States v. Florida East Coast Railway,
                410 U.S. 224 (1973), the Court established the rule that it is
                necessary to examine the particular statute involved when determining
                whether notice-and-comment procedures under 5 U.S.C. 553 are available
                or, alternatively, whether there is a right to a formal hearing. In
                general, unless a statute specifically provides for rules to be made on
                the record after a hearing, the Federal courts have held that the
                informal rulemaking procedure is applicable. Thus, even statutory
                language such as ``due notice and opportunity for a public hearing,''
                and ``opportunity for hearing,'' have been held to mandate only
                informal procedures under 5 U.S.C. 553. See 3 Administrative Law 16.03
                (2018).
                 One Federal court specifically addressed the language in 18 U.S.C.
                [[Page 66543]]
                926(b), on which one commenter relied, and rejected the commenter's
                position. In that case, the plaintiff contended ``that all of the
                regulations must be invalidated because the Secretary failed to follow
                the procedures mandated in FOPA by refusing to afford interested
                parties an opportunity for an oral hearing.'' However, the court held
                that the agency provided an ``opportunity'' for a hearing even though
                it decided against an oral hearing. The court wrote:
                 FOPA contains no provision guaranteeing interested parties the
                right to an oral hearing. . . . It is well-settled that the
                requirement of a hearing does not necessitate that the hearing be
                oral. Here, the Secretary, pursuant to regulation, reserved for
                himself the right to determine whether an oral hearing should be
                held. He ultimately determined that an oral hearing was unwarranted,
                but did provide interested parties with the opportunity to submit
                written comments. This is all the hearing requirement in Sec.
                926(b) demands.
                Nat'l Rifle Ass'n v. Brady, 914 F.2d 475, 485 (4th Cir. 1990)
                (citations omitted). Here, the Department has made the same
                determination that an oral hearing is unnecessary.
                V. Final Rule
                 This final rule adopts, with minor changes, the proposed amendments
                to the definition of ``machine gun'' in 27 CFR 447.11, 478.11, and
                479.11, which include clarification of the meaning of ``automatically''
                and ``single function of the trigger'' and clarification that bump-
                stock-type devices are machineguns. The Department accordingly
                determined that persons in possession of bump-stock-type devices must
                destroy or abandon the devices.
                 In response to comments received and discussed in Part IV, the
                Department added employees of manufacturers and one additional
                manufacturer to the populations potentially affected by this rule, and
                incorporated sales tax of $19.00 per bump-stock-type device as part of
                the economic analysis. Also, the Department considered additional
                alternatives and inserted an OMB Circular A-4 Accounting Statement for
                clarity.
                VI. Statutory and Executive Order Review
                A. Executive Orders 12866, 13563, and 13771
                 Executive Orders 13563 (Improving Regulation and Regulatory Review)
                and 12866 (Regulatory Planning and Review) direct agencies to assess
                the costs and benefits of available regulatory alternatives and, if
                regulation is necessary, to select regulatory approaches that maximize
                net benefits (including potential economic, environmental, public
                health, and safety effects, distributive impacts, and equity).
                Executive Order 13563 emphasizes the importance of quantifying both
                costs and benefits, reducing costs, harmonizing rules, and promoting
                flexibility. Executive Order 13771 (Reducing Regulation and Controlling
                Regulatory Costs) directs agencies to reduce regulation and control
                regulatory costs. This final rule is expected to have an impact of over
                $100 million in the first year of this regulatory action. Details on
                the estimated costs of this final rule can be found in the rule's
                economic analysis below.
                 The Attorney General has determined this rule is a ``significant
                regulatory action'' that is economically significant under section
                3(f)(1) of Executive Order 12866 because, as discussed, the rule will
                have an annual effect on the economy of $100 million or more.
                Accordingly, the rule has been reviewed by the Office of Management and
                Budget. This rule is a significant regulatory action that clarifies the
                meaning of the statutory definition of machinegun and reflects the
                public safety goals of the NFA and GCA. Further, this rule is a
                regulatory action subject to Executive Order 13771. See OMB, Guidance
                Implementing Executive Order 13771, Titled ``Reducing Regulation and
                Controlling Regulatory Costs'' (Apr. 5, 2017).
                 This final rule is intended to interpret the definition of
                ``machinegun'' within the NFA and GCA such that it includes a bump-
                stock-type device, i.e., a device that allows a semiautomatic firearm
                to shoot more than one shot with a single pull of the trigger by
                harnessing the recoil energy of the semiautomatic firearm to which it
                is affixed so that the trigger resets and continues firing without
                additional physical manipulation of the trigger by the shooter.
                Accounting Statement
                 Table 1 provides the annualized and unquantified costs and benefits
                to this final rule. These costs are annualized and discounted at 3% and
                7%.
                 Table 1--OMB Circular A-4 Accounting Statement
                
                
                --------------------------------------------------------------------------------------------------------------------------------------------------------
                Category Primary estimate
                 Minimum estimate
                 Midrange estimate Source........
                --------------------------------------------------------------------------------------------------------------------------------------------------------
                 Benefits
                --------------------------------------------------------------------------------------------------------------------------------------------------------
                Annualized monetized benefits (7%)........... N/A........... (7%).......... N/A........... (7%).......... N/A........... Final Rule.
                 (discount rate in parentheses).
                 (3%)........... N/A........... (3%).......... N/A........... (3%).......... N/A...........
                --------------------------------------------------------------------------------------------------------------------------------------------------------
                Unquantified Benefits.......... Limit access to bump-stock-type devices Final Rule.
                 Prevents usage of bump-stock-type devices for criminal purposes.
                 Intended to reduce casualties in mass shootings.
                 Intended to help protect first responders when responding to shooting incidents.
                --------------------------------------------------------------------------------------------------------------------------------------------------------
                 Costs
                --------------------------------------------------------------------------------------------------------------------------------------------------------
                Annualized monetized costs (7%)........... $35.0 mil..... (7%).......... $28.9 mil..... (7%).......... $32.0 mil..... Final Rule.
                 (discount rate in parentheses).
                 (3%)........... $32.8 mil..... (3%).......... $27.6 mil..... (3%).......... $31.2 mil..... Final Rule.
                --------------------------------------------------------------------------------------------------------------------------------------------------------
                Qualitative costs Potential loss of wages for employees of bump-stock-type device manufacturers Final Rule.
                 (unquantified).
                 Costs of advertising to inform owners of the need to dispose of their bump-stock-type
                 devices
                 Lost consumer surplus to users of bump-stock-type devices.
                --------------------------------------------------------------------------------------------------------------------------------------------------------
                 Transfers
                --------------------------------------------------------------------------------------------------------------------------------------------------------
                Annualized monetized transfers: 0
                 ``on budget''.
                 0
                 0 Final Rule....
                --------------------------------------------------------------------------------------------------------------------------------------------------------
                From whom to whom?............. N/A
                 N/A
                 N/A None..........
                --------------------------------------------------------------------------------------------------------------------------------------------------------
                Annualized monetized transfers: 0
                 ``off-budget''.
                 0
                 0 Final Rule....
                --------------------------------------------------------------------------------------------------------------------------------------------------------
                From whom to whom?............. N/A
                 N/A
                 N/A None..........
                --------------------------------------------------------------------------------------------------------------------------------------------------------
                [[Page 66544]]
                 Table 1--OMB Circular A-4 Accounting Statement--Continued
                
                
                --------------------------------------------------------------------------------------------------------------------------------------------------------
                Category Primary estimate
                 Minimum estimate
                 Midrange estimate Source........
                --------------------------------------------------------------------------------------------------------------------------------------------------------
                Miscellaneous analysis/category Effects Source citation
                --------------------------------------------------------------------------------------------------------------------------------------------------------
                Effects on State, local, and/or None. None.
                 tribal governments.
                --------------------------------------------------------------------------------------------------------------------------------------------------------
                Effects on small businesses.... Significant effect on small businesses. Prepared FRFA. RFA.
                --------------------------------------------------------------------------------------------------------------------------------------------------------
                Effects on wages............... None. None.
                --------------------------------------------------------------------------------------------------------------------------------------------------------
                Effects on growth.............. None. None.
                --------------------------------------------------------------------------------------------------------------------------------------------------------
                Need for Federal Regulatory Action
                 Agencies take regulatory action for various reasons. One of the
                reasons is to carry out Congress's policy decisions, as expressed in
                statutes. Here, this rulemaking aims to apply Congress's policy
                decision to prohibit machineguns. Another reason underpinning
                regulatory action is the failure of the market to compensate for
                negative externalities caused by commercial activity. A negative
                externality can be the byproduct of a transaction between two parties
                that is not accounted for in the transaction. This final rule is
                addressing a negative externality. The negative externality of the
                commercial sale of bump-stock-type devices is that they could be used
                for criminal purposes. This poses a public safety issue that the
                Department is trying to address.
                Summary of Affected Population, Costs, and Benefits
                 Table 2 provides a summary of the affected population and
                anticipated costs and benefits to promulgating this rule.
                 Table 2--Summary of Affected Population, Costs, and Benefits
                ------------------------------------------------------------------------
                 Affected populations, costs, and
                 Category benefits
                ------------------------------------------------------------------------
                Applicability..................... Manufacturers of bump-stock-
                 type devices.
                 Employees of bump-stock-
                 type device manufacturers.
                 Retail sellers of bump-
                 stock-type devices.
                 Gun owners who own bump-
                 stock-type devices or would have
                 purchased them in the future.
                Affected Population............... 1 manufacturer of bump-
                 stock-type devices.
                 2,281 retailers of bump-
                 stock-type devices.
                 Owners and future consumers
                 of bump-stock-type devices.
                Total Quantified Costs to $245.5 million present
                 Industry, Public, and Government value over 10 years.
                 (7% Discount Rate). $35.0 million annualized.
                Unquantified Costs................ Potential loss of wages for
                 employees of bump-stock-type device
                 manufacturers.
                 Costs of advertising to
                 inform owners of the need to
                 dispose of their bump-stock-type
                 devices.
                 Lost consumer surplus to
                 users of bump-stock-type devices.
                Unquantified Benefits............. Limits access to bump-stock-
                 type devices.
                 Prevents usage of bump-
                 stock-type devices for criminal
                 purposes.
                 Intended to reduce
                 casualties in mass shootings.
                 Intended to help protect
                 first responders when responding to
                 shooting incidents.
                ------------------------------------------------------------------------
                Changes from the NPRM to FR
                 Table 3 presents a summary of the changes to economic effects from
                NPRM to final rule.
                 Table 3--Changes in Bump-Stock-Type Devices From NPRM to the Final Rule
                ----------------------------------------------------------------------------------------------------------------
                 Description of
                 Variables NPRM Final Rule Difference Changes
                ----------------------------------------------------------------------------------------------------------------
                Applicability................... N/A............... Employees of bump- Adding employees Per public
                 stock-type device of bump-stock- comment, ATF
                 manufacturers. type device included
                 manufacturers. employees of
                 manufacturers
                 qualitatively.
                 2 manufacturers... 1 manufacturer.... Subtracted 1...... Based on publicly
                 available
                 information.
                Cost of Bump-Stock-Type Devices. $301.............. $320.............. $19............... Per public
                 comment, ATF
                 included State
                 and local taxes.
                Destruction..................... $5.4 million...... $9.4 million...... $3.9 million...... Change in policy.
                Future Sales.................... $213.0 million.... $198.9 million.... $14.1 million..... Change from 2
                 large retailers
                 selling bump-
                 stock-type
                 devices to 1.
                Government Cost................. $0................ $1.3 million...... $1.3 million...... Change in policy.
                ----------------------------------------------------------------------------------------------------------------
                [[Page 66545]]
                
                 Alternatives
                ----------------------------------------------------------------------------------------------------------------
                Amnesty or ``grandfathering''... This alternative was rejected because since the passage of Per public
                 18 U.S.C. 922(o), amnesty registration of machineguns is comment.
                 not legally permissible
                ----------------------------------------------------------------------------------------------------------------
                Licensing and background checks. This alternative was rejected because only Congress can Per public
                 add a new class of firearm and impose licensing or comment.
                 acquisition requirements on them.
                ----------------------------------------------------------------------------------------------------------------
                Remuneration.................... This alternative was rejected because only Congress has Per public
                 the authority to offer monetary compensation. comment.
                ----------------------------------------------------------------------------------------------------------------
                Medical exemption............... This alternative was rejected because neither the NFA nor Per public
                 the GCA provides for medical exemptions to acquire a comment.
                 firearm. Only Congress can add medical exemptions
                ----------------------------------------------------------------------------------------------------------------
                Future production and sales..... This alternative was rejected because ATF does not have Per public
                 the authority to restrict only the future manufacture or comment.
                 sale of bump-stock-type devices
                ----------------------------------------------------------------------------------------------------------------
                Quota........................... This alternative was rejected because ATF lacks authority Per public
                 to implement it, as all devices determined to be comment.
                 machineguns are prohibited across the board
                ----------------------------------------------------------------------------------------------------------------
                Instituting a tax............... This alternative was rejected because excise tax is Per public
                 regulated by statute and only Congress can determine the comment.
                 amount of excise tax on an item
                ----------------------------------------------------------------------------------------------------------------
                Improved security at mass events This alternative was rejected because improved security Per public
                 must be paired with reasonable regulations to increase comment.
                 public safety and reduce violent crime
                ----------------------------------------------------------------------------------------------------------------
                Congressional legislation....... This alternative was rejected because ATF has been Per public
                 delegated authority to issue rules to implement the NFA comment.
                 and GCA. This action will not prevent Congress from
                 taking action on bump-stock-type devices
                ----------------------------------------------------------------------------------------------------------------
                Leave to States to regulate..... This alternative was rejected because ATF prioritizes Per public
                 public safety and preventing crime. This action will not comment.
                 prevent States from taking action on bump-stock-type
                 devices
                ----------------------------------------------------------------------------------------------------------------
                Improved law enforcement........ This alternative was rejected because training and Per public
                 equipment must be paired with reasonable regulatory comment.
                 efforts to increase public safety and reduce violent
                 crime
                ----------------------------------------------------------------------------------------------------------------
                Affected Population
                 The populations affected by this rule are manufacturers of bump-
                stock-type devices, employees of bump-stock-type device manufacturers,
                retailers who sell them either in brick-and-mortar stores or online,
                and individuals who have purchased or would have wanted to purchase
                bump-stock-type devices. The number of entities and individuals
                affected are as follows:
                 1 manufacturer
                 2,281 retailers
                 An uncertain number of individuals who have purchased bump-
                stock-type devices or would have purchased them in the future \15\
                ---------------------------------------------------------------------------
                 \15\ Note that many commenters assumed that each person who owns
                a bump-stock-type device owns one device. This overestimates the
                number of owners because owners of such devices may own more than
                one, as evidenced by the Las Vegas shooter, who allegedly owned at
                least 12.
                ---------------------------------------------------------------------------
                 An estimated 22 employees who were employed by one
                manufacturer, based on public comments \16\
                ---------------------------------------------------------------------------
                 \16\ Regulations.gov, Docket ID: ATF-2018-0002-16668, available
                at https://www.regulations.gov/document?D=ATF-2018-0002-16668 (last
                visited Nov. 16, 2018).
                 Because many bump-stock-type devices--including those ATF addressed
                in classification letters between 2008 and 2017--have not been subject
                to regulation under the GCA, ATF does not keep track of manufacturers
                or retailers of bump-stock-type devices, nor does ATF keep track or
                maintain a database of individuals who have purchased bump-stock-type
                devices. Therefore, the affected population of manufacturers and
                retailers is an estimate and based on publicly available information
                and, with respect to retailers who are also Federal firearms licensees
                (FFLs), is also based on ATF's records in the Federal Firearms
                Licensing System.
                 Based on publicly available information and comments on the NPRM,
                ATF estimates that since 2010, as many as seven domestic bump-stock-
                type device manufacturers have been in the marketplace, but due to
                patent infringement litigation, only three remained in the market.
                However, it appears two have ceased manufacturing bump-stock-type
                devices since publication of the NPRM due their inability to obtain
                liability insurance. For the estimate of the number of retailers, ATF
                filtered all FFLs for a list of potential sellers. While there are
                approximately 80,000 FFLs currently licensed, only certain types of
                FFLs sell firearms to the public. ATF first removed FFLs that do not
                sell firearms to the public. Next, since not all FFLs sell firearm
                accessories, ATF needed to estimate the number that do sell
                accessories. ATF assumed that FFLs that are likely to sell bump-stock-
                type devices also have websites. ATF ran a query on the FFL database
                and found that of those that sell firearms to the public, 2,270 have
                websites. Because sellers of firearm accessories do not necessarily
                sell firearms, ATF also performed an online search and found an
                additional 11 retailers who sell firearm accessories, but not firearms.
                Adding these two totals together, ATF estimates that there are 2,281
                retailers of bump-stock-type devices.
                 Because there are no records of individuals who have purchased
                firearm accessories, ATF does not have an estimated number of
                individuals who will be affected by this final rule. Although ATF lacks
                data on the number
                [[Page 66546]]
                of individuals who have purchased bump-stock-type devices, ATF has some
                information from one manufacturer and four retailers on the volume of
                sales of such devices. Based on these reported amounts, ATF estimates
                that the number of bump-stock-type devices that were purchased during
                the 8-year period beginning in 2010 ranges from 35,000 per year as a
                low estimate to 75,000 per year as the high and primary estimate. ATF
                used a public commenter's estimate of 400,000 total devices in
                circulation as a third estimate. For further information on the
                methodology of these estimates, please review the analysis regarding
                ``Costs'' below.
                Costs
                 There are four primary sources of costs from this rule. First, for
                owners of bump-stock-type devices, there will be a lost value from no
                longer being able to possess or use the devices. Second, there will be
                a lost value from future sales of the devices. Third, there is a
                disposal cost associated with the need to destroy the devices or
                abandon them at the nearest ATF office. Finally, there will be a
                potential loss of wages from employees losing jobs from loss of
                manufacturing; however, the extent to which they will be unable to find
                replacement jobs is speculative.
                Manufacturing and Startup Cost
                 Commenters suggested that ATF overlooked the capital expenses to
                start up a company to manufacture bump-stock-type devices. The
                Department considered the capital expenses for manufacturers. However,
                in light of the Las Vegas shooting and potential crowding of additional
                manufacturers, the Department determined that the potential for
                manufacturers to continue business in a potentially saturated market
                was doubtful. Furthermore, the Department has already calculated the
                foregone return on investment when the Department considered foregone
                production, so accounting for capital expenses would be double counting
                of expenditures. Therefore, the viability that these businesses will be
                successful is speculative and the capital expenses that they incurred
                are a sunk cost for those who put in the expense.
                Cost to the Public for Loss of Property
                 One reason individuals purchase bump-stock-type devices is so that
                they can simulate automatic firing on a semiautomatic firearm.
                Commenters noted a variety of purposes for which bump-stock-type
                devices have been advertised and used, including for recreation and
                fun, assisting persons with mobility issues in firing quickly, self-
                defense, killing invasive pig species, and target practice (although,
                as some commenters observed, bump-stock-type devices impede firing
                accuracy). After implementation of this final rule, bump-stock-type
                devices that meet the definition of ``machinegun'' under the NFA and
                GCA cannot be lawfully possessed because the pertinent provision of the
                GCA, 18 U.S.C. 922(o), prohibits persons from possessing a machinegun
                unless it was lawfully possessed before the effective date of section
                922(o). Bump-stock-type devices currently possessed by individuals will
                have to be destroyed or abandoned prior to the effective date of this
                regulation.
                 The lost value from no longer being able to use or purchase bump-
                stock-type devices will depend on the volume of sales in the market and
                the value that consumers place on the devices. ATF has limited
                information about the market for bump-stock-type devices. ATF first
                developed an estimate of the number of bump-stock-type devices in the
                marketplace based on information on retail sales provided in response
                to the ANPRM. One ANPRM commenter estimated that more than 400,000
                bump-stock-type devices may have been sold. Based on publicly available
                information, ATF estimates that in the first two years that bump-stock-
                type devices were in the market, approximately 35,000 were sold per
                year.\17\ However, after 2011, other manufacturers entered the market
                and there is no available information regarding the total number of
                bump-stock-type devices manufactured. ATF is using publicly available
                information on manufacturing and combining it with the information on
                retail sales to estimate a range of the number of bump-stock-type
                devices in the marketplace.
                ---------------------------------------------------------------------------
                 \17\ Donnie A. Lucas, Firing Up Some Simple Solutions, Albany
                News (Dec. 22, 2011), http://www.thealbanynews.net/archives/2443.
                ---------------------------------------------------------------------------
                 One retailer stated that it sold an average of 4,000 to 5,000 bump-
                stock-type devices per year.\18\ One commenter indicated that one
                retailer sold 3,800 bump-stock-type devices annually, one sold 60 per
                year, and one sold approximately 5-10 per year.\19\ For the purposes of
                this regulatory analysis (RA), ATF assumes that a large retailer has
                sold 4,400, a midrange retailer has sold 60, and a small retailer has
                sold 8.\20\ For the purposes of this analysis, ATF assumes the number
                of retailers by size are as follows:
                ---------------------------------------------------------------------------
                 \18\ Based on an internal survey of large retailers.
                 \19\ Regulations.gov, Docket ID: ATF-2018-0001-27509, https://www.regulations.gov/document?D=ATF-2018-0001-27509 (last visited on
                Nov. 16, 2018); Regulations.gov, Docket ID: ATF-2018-0001-0433,
                https://www.regulations.gov/document?D=ATF-2018-0001-0433 (last
                visited on Nov. 16, 2018); Regulations.gov, Docket ID: ATF-2018-
                0001-0128, https://www.regulations.gov/document?D=ATF-2018-0001-0128
                (last visited on Nov. 16, 2018).
                 \20\ For a large retailer the average sales were 4,400 = (3,800
                + 5,000)/2. For a small retailer, the average sales were 8 = (5 +
                10)/2.
                 4 large * 4,400 annual sales
                 755 midrange * 60 annual sales
                 1,511 small * 8 annual sales
                 The number of large retailers is a known number. As stated in the
                Affected Population section above, based on ATF's internal database and
                online research, the remaining number of retailers is 2,270. For the
                purposes of this RA, ATF estimated that one-third of the remaining
                retailer population are midrange retailers, and the remaining 1,511 are
                small retailers. Using these estimated numbers of retailers and annual
                sales by size of retailer, ATF estimated annual sales of about 75,000
                [(4 * 4,400) + (755 * 60) + (1,511 * 8)].
                 ATF next developed an estimate of the number of bump-stock-type
                devices in the United States based on information about the number of
                bump-stock-type devices manufactured. Based on publicly available
                information, ATF estimates that approximately 35,000 bump-stock-type
                devices were sold in 2010.\21\ Only in 2012 did other manufacturers
                enter the marketplace. For the purposes of this RA, ATF assumes that in
                the first two years of production, the one manufacturer produced the
                same 35,000 in years 2010 and 2011. ATF has two sets of production
                estimates. Because no information is otherwise known about the
                production of bump-stock-type devices, ATF assumes that the low
                estimate of annual bump-stock-type device production is a constant
                35,000, based on the one data point. As stated earlier, a public
                commenter provided an estimate of 400,000 bump-stock-type devices
                currently in circulation. To account for how these were purchased over
                the last 8 years, ATF also assumed the same 35,000 production in the
                first 2 years, but spread out the remaining 330,000 over the remaining
                6 years, or about 55,000 per year. However, there were public comments
                that stated how many bump-stock-type devices were sold by that
                retailer. Using the retail sales information, ATF developed a third,
                higher estimate reflecting that when the other manufacturers entered
                the market, the number of bump-stock-type devices sold on the market
                annually could have been 75,000.
                ---------------------------------------------------------------------------
                 \21\ Lucas, supra note 17.
                ---------------------------------------------------------------------------
                 The high estimate is ATF's primary estimate because ATF knows that
                there
                [[Page 66547]]
                was an increase in production starting in 2012. In 2012, there were
                other manufacturers who entered the market, and the first manufacturer
                increased production at some point thereafter. Furthermore, the primary
                estimate includes information provided by retailers as a more
                comprehensive outlook on the overall production numbers. For the
                purposes of this analysis, ATF assumes that both the increase in
                production and the market entry of other manufacturers all occurred in
                2012. Table 4 provides the breakdown of production for the low
                estimate, public comment estimate, and primary estimate.
                 Table 4--Number of Bump-Stock-Type Devices Produced, Based on Manufacturer and Retail Sales
                ----------------------------------------------------------------------------------------------------------------
                 Public comment Primary
                 Year Low estimate estimate estimate
                ----------------------------------------------------------------------------------------------------------------
                2010............................................................ 35,000 35,000 35,000
                2011............................................................ 35,000 35,000 35,000
                2012............................................................ 35,000 55,000 75,000
                2013............................................................ 35,000 55,000 75,000
                2014............................................................ 35,000 55,000 75,000
                2015............................................................ 35,000 55,000 75,000
                2016............................................................ 35,000 55,000 75,000
                2017............................................................ 35,000 55,000 75,000
                 -----------------------------------------------
                 Total....................................................... 280,000 400,000 520,000
                ----------------------------------------------------------------------------------------------------------------
                 In other words, the number of bump-stock-type devices held by the
                public could range from about 280,000 to about 520,000.
                 ATF does not know the production cost of bump-stock-type devices,
                but for the purposes of this RA, ATF uses the retail sales amounts as a
                proxy for the total value of these devices. For devices that have
                already been sold, there are two countervailing effects that affect the
                value of the devices. There may have been some depreciation of the
                devices since they were originally purchased, resulting in a value
                somewhat reduced from the retail price. On the other hand, some
                consumers may have been willing to pay more than the retail price for a
                bump-stock-type device, and for these individuals the devices would
                have a higher valuation than the retail price. Both of these effects
                are difficult to estimate, and here ATF assumes that the retail sales
                price is a reasonable proxy for the value of the devices.
                 The primary manufacturer of bump-stock-type devices sells them at a
                price of $179.95 to $425.95.\22\ For the purposes of this RA, ATF
                estimates that the average sale price, including State and local taxes,
                for these bump-stock-type devices was $320.00 during the first two
                years they were sold. In 2012, at least one other manufacturer entered
                the market and started selling its devices at the rate of $99.99,
                making the overall prices for these devices lower.\23\ For the purposes
                of this RA, ATF assumes that the average sale price, including State
                and local taxes, for bump-stock-type devices from 2012 to 2017 was
                $213.00. Based on these costs, multiplied by the number of bump-stock-
                type devices in the market, Table 5 provides the sales value that the
                public has spent on these devices over the course of the last eight
                years.
                ---------------------------------------------------------------------------
                 \22\ Slide Fire AR-15 Bump Fire Stocks (archived page on Jan.
                28, 2017), https://web.archive.org/web/20170128085532/http://www.slidefire.com/products/ar-platform (last visited Nov. 28, 2018).
                 \23\ Bump Fire Systems (archived page on Feb. 21, 2015), https://web.archive.org/web/20150221050223/http://bumpfiresystems.com/
                (last visited Nov. 28, 2018).
                 Table 5--Amount Spent on Bump-Stock-Type Devices
                 [Undiscounted]
                ----------------------------------------------------------------------------------------------------------------
                 Midrange
                 Year Low estimate estimate Primary
                ----------------------------------------------------------------------------------------------------------------
                2011............................................................ $11,214,896 $11,214,896 $11,214,896
                2012............................................................ 11,214,896 11,214,896 11,214,896
                2013............................................................ 7,470,511 11,739,374 16,008,237
                2014............................................................ 7,470,511 11,739,374 16,008,237
                2015............................................................ 7,470,511 11,739,374 16,008,237
                2016............................................................ 7,470,511 11,739,374 16,008,237
                2017............................................................ 7,470,511 11,739,374 16,008,237
                 -----------------------------------------------
                 Total....................................................... 59,782,345 81,126,661 102,470,977
                ----------------------------------------------------------------------------------------------------------------
                 ATF estimates that the total, undiscounted amount spent on bump-
                stock-type devices was $102.5 million. While the retail prices of these
                bump-stock-type devices remained constant over the eight years of
                sales, these purchases occurred over time; therefore, ATF presents the
                discounted value at 3% and 7% in Table 6 to account for the present
                value of these purchases.
                [[Page 66548]]
                 Table 6--The Amount Spent Purchasing Bump-Stock-Type Devices, Discounted at 3% and 7%
                ----------------------------------------------------------------------------------------------------------------
                 Year Undiscounted 3% 7%
                ----------------------------------------------------------------------------------------------------------------
                2011............................................................ $11,214,896 $13,001,138 $15,729,472
                2012............................................................ 11,214,896 12,622,464 14,700,441
                2013............................................................ 16,008,237 17,492,633 19,610,779
                2014............................................................ 16,008,237 16,983,139 18,327,831
                2015............................................................ 16,008,237 16,488,484 17,128,814
                2016............................................................ 16,008,237 16,008,237 16,008,237
                2017............................................................ 16,008,237 15,541,978 14,960,969
                 -----------------------------------------------
                 Total....................................................... 102,470,977 108,138,073 116,466,542
                Annualized Cost................................................. .............. 15,404,959 19,504,391
                ----------------------------------------------------------------------------------------------------------------
                 Because these purchases occurred in the past, ATF's discount years
                start at -5 and increase to 0 to account for the Executive Order 13771
                standard that costs be presented in 2016 dollars. With these
                assumptions, ATF estimates that the annualized, discounted amount spent
                on bump-stock-type devices was $15.4 million and $19.5 million at 3%
                and 7%, respectively.
                 Based on the same discounting formula, ATF estimates that the total
                undiscounted cost for the low estimate is $59.7 million, and the total
                discounted values are $64.1 million and $70.6 million at 3% and 7%,
                respectively. The annualized values for the low estimates of the total
                number of bump-stock-type devices sold are $9.1 million and $11.8
                million at 3% and 7%, respectively. For the 400,000-unit estimate
                provided by the public commenter, the total undiscounted amount is
                $81.1 million, and the total discounted values would be $86.1 million
                and $93.5 million at 3% and 7%, respectively. The annualized values for
                the 400,000-unit sales estimate are $12.3 million and $15.7 million at
                3% and 7%, respectively.
                Forgone Future Production and Sales
                 ATF has estimated the lost production and lost sales that will
                occur in the 10 years after the implementation of this final rule.
                These estimates take into account lost revenue from manufacturers and
                retailers. ATF does not parse out manufacturing and retail sales, in
                order to limit double counting. In order to do this, ATF needed to
                predict the number of devices that would have been sold in the future
                in the absence of a rule. Such a prediction should take account of
                recent expected changes in the demand for and supply of bump-stock-type
                devices. For example, based on a survey, three of the four known, large
                former retailers of bump-stock-type devices no longer sell bump-stock-
                type devices as a result of the Las Vegas shooting, nor do they intend
                to sell them in the future. Moreover, while ATF has estimated the
                number of bump-stock-type devices manufactured since 2010, ATF is
                without sufficient information to estimate the number of individuals
                who were interested in acquiring bump-stock-type devices prior to the
                Las Vegas shooting but would no longer want them due to the shooting.
                 Another recent change affecting individuals' future purchases of
                bump-stock-type devices is that certain States have already banned such
                devices. These States are California, Connecticut, Delaware, Florida,
                Hawaii, Maryland, Massachusetts, New Jersey, Rhode Island, Vermont, and
                Washington.\24\ The effect of States' bans on individuals' future
                purchases of bump-stock-type devices should not be attributed to this
                final rule since these reductions in purchases will happen with or
                without the rule. However, ATF was unable to quantify the impact of
                States' bans and thus was unable to account for the future effects of
                these bans in the estimate of the effects of the final rule.
                ---------------------------------------------------------------------------
                 \24\ Cal. Penal Code sections 16930, 32900 (2018); 2018 Conn.
                Acts 18-29 (Reg. Sess.); Del. Code Ann. tit. 11, section 1444(a)(6)
                (2018); Fla. Stat. section 790.222 (2018); Haw. Rev. Stat. section
                134-8.5 (2018); Md. Code. Ann., Crim. Law section 4-305.1 (2018);
                Mass. Gen. Laws ch. 140, section 121, 131 (2018); N.J. Stat. Ann.
                sections 2C:39-3(l), 2C:39-9(j); 11 R.I. Gen. Laws section 11-47-
                8(d) (2018); Vt. Stat. Ann. tit. 13, section 4022 (2018); 2018 Wash.
                Sess. Laws ch. 7, pp. 196-220.
                ---------------------------------------------------------------------------
                 Based on previously mentioned comments from large retailers, ATF
                expects that, even in the absence of this rule, some retailers would
                not sell bump-stock-type devices in the future. In order to estimate
                the expected future reduction in demand for bump-stock-type devices as
                a result of the Las Vegas shooting, ATF assumes that the reduction of
                sales by large retailers that has already occurred would be a
                reasonable estimate of the future reduction of sales overall that would
                occur in the absence of this rule. In the NPRM, ATF estimated that two
                of the four large retailers would remain in the market to sell bump-
                stock-type devices. 83 FR at 13452. Since then, one of these remaining
                retailers merged with one of the large retailers that opted not to sell
                bump-stock-type devices, resulting in only one large retailer remaining
                in the market. For the purposes of this regulatory analysis, it is
                estimated that the one large retailer that would otherwise intend to
                keep selling bump-stock-type devices sells 4,400 of such devices
                annually. Removing the effects of these three large retailers from the
                future market reduces ATF's primary estimate of 74,988 in past annual
                production to an estimate of 62,084 (= 75,284-13,200) in annual sales
                that would have occurred in the future in the absence of this rule.
                Table 7 provides the estimated breakdown of lost production and sales
                forgone due to this rule.
                 Table 7--Forgone Production and Sales of Future Bump-Stock-Type Devices
                ----------------------------------------------------------------------------------------------------------------
                 Number of bump-
                 Year stock-type devices Undiscounted 3% 7%
                ----------------------------------------------------------------------------------------------------------------
                2018............................ 62,084 $19,893,303 $19,313,886.10 $18,591,871.67
                2019............................ 62,084 19,893,303 18,751,345.73 17,375,581.00
                2020............................ 62,084 19,893,303 18,205,190.03 16,238,860.74
                [[Page 66549]]
                
                2021............................ 62,084 19,893,303 17,674,941.77 15,176,505.37
                2022............................ 62,084 19,893,303 17,160,137.64 14,183,649.88
                2023............................ 62,084 19,893,303 16,660,327.81 13,255,747.55
                2024............................ 62,084 19,893,303 16,175,075.54 12,388,549.11
                2025............................ 62,084 19,893,303 15,703,956.84 11,578,083.28
                2026............................ 62,084 19,893,303 15,246,560.04 10,820,638.58
                2027............................ 62,084 19,893,303 14,802,485.47 10,112,746.34
                 -------------------------------------------------------------------------------
                 Total....................... .................. 198,933,027 169,693,906.98 139,722,233.51
                Annualized Cost................. .................. .................. 24,173,981.19 23,398,969.82
                ----------------------------------------------------------------------------------------------------------------
                 Based on these estimates, ATF estimates that the undiscounted value
                of forgone future sales over 10 years is $198.9 million, undiscounted,
                or $24.2 million and $23.4 million, annualized and discounted at 3% and
                7%.
                Disposal
                 This final rule requires the destruction of existing bump-stock-
                type devices. The cost of disposal has several components. For
                individuals who own bump-stock-type devices, there is a cost for the
                time and effort to destroy the devices or ensure that they are
                destroyed by another party. For retailers, wholesalers, and
                manufacturers, there is a cost of the time and effort to destroy or
                ensure the destruction of any devices held in inventory. In addition,
                this final rule incorporates the option of abandoning bump-stock-type
                devices at an ATF office. Based on the response from commenters, this
                cost is taken into consideration under the foregone sales section.
                 Individuals who have purchased bump-stock-type devices prior to the
                implementation of this rule must destroy the devices themselves prior
                to the effective date of the rule or abandon them at their local ATF
                office. Options for destroying the devices include melting, crushing,
                or shredding in a manner that renders the device incapable of ready
                restoration. Since the majority of bump-stock-type devices are made of
                plastic material, individuals can use a hammer to break apart the
                devices and throw the pieces away. Other destruction options that ATF
                has historically accepted include torch cutting or sawing the device in
                a manner that removes at least \1/4\ inch of material for each cut and
                completely severs design features critical to the functionality of the
                device as a bump-stock-type device.
                 Current possessors are encouraged to undertake destruction of the
                devices. However, current possessors also have the option to abandon
                bump-stock-type devices at the nearest ATF office. Current possessors
                of bump-stock-type devices will have until the effective date of the
                rule (90 days from date of publication in the Federal Register) to
                comply. Additional information on the destruction of bump-stock-type
                devices will be available on www.atf.gov.
                 Based on comments received on the ANPRM, unsellable inventory could
                be worth approximately $35,000 per large retailer. One commenter,
                assumed to be a large retailer, stated that its gross sales were
                $140,000. Another commenter assumed to be a midrange retailer had gross
                sales of $18,000. No known sales were reported for a small retailer.
                Based on the proportion of sales among the large, midrange, and small
                retailers, ATF estimates that the amounts in existing inventory for
                each type of retailer are as follows:
                 Large retailer: $35,000;
                 midrange retailer: $4,500; and
                 small retailer: $74.\25\
                ---------------------------------------------------------------------------
                 \25\ Midrange: $4,500 = ($18,000/$140,000) * $35,000. Small: $74
                = (8/3,800) * $35,000.
                There were no comments on the NPRM about these assumptions or the
                methodology used based on the ANPRM comments. Therefore, the analysis
                used to determine the cost of unsellable inventory remains the same for
                this final rule.
                 The commenter assumed to be a large retailer also commented that
                the opportunity cost of time needed to destroy existing inventory will
                be approximately $700. ATF's subject matter experts estimate that a
                retailer could use a maintenance crew to destroy existing inventory. To
                determine the hourly time needed to destroy existing inventory, ATF
                used the $700 reported amount, divided by the loaded wage rate of a
                building cleaning worker. ATF subject matter experts also suggest that
                existing packers would be used for a midrange retailer and the minimum
                wage would be used for a small retailer. A multiplier of 1.43 was
                applied to unloaded wage rates to account for fringe benefits.\26\
                Table 9 provides the wages used for this analysis.
                ---------------------------------------------------------------------------
                 \26\ BLS Series ID CMU2010000000000D, CMU2010000000000P (Private
                Industry Compensation = $32.35)/(Private Industry Wages and Salaries
                = $22.55) = 1.43. BLS average 2016. U.S. Bureau of Labor Statistics,
                https://beta.bls.gov/dataQuery/find?fq=survey:[cm]&s=popularity:D.
                 Table 9--Wage Series To Destroy Existing Inventory
                ----------------------------------------------------------------------------------------------------------------
                 Unloaded wage Loaded wage
                 Wage series Series code rate rate Source
                ----------------------------------------------------------------------------------------------------------------
                Individual....................... ................... $13.60 $13.60 https://www.transportation.gov/sites/dot.gov/files/docs/2016%20Revised%20Value%20of%20Travel%20Time%20Guidance.pdf.
                Minimum Wage Rate................ Min Wage........... 7.25 10.40 https://www.bls.gov/opub/reports/minimum-wage/2016/home.htm.
                Packers, Packagers, and Handlers. 53-7064............ 11.74 16.84 https://www.bls.gov/oes/2016/may/oes537064.htm.
                Retail Salespersons.............. 41-2031............ 13.07 18.75 https://www.bls.gov/oes/2016/may/oes412031.htm.
                [[Page 66550]]
                
                Building Cleaning Workers, All 37-2019............ 14.88 21.34 https://www.bls.gov/oes/
                 Other. 2016/may/oes372019.htm.
                ----------------------------------------------------------------------------------------------------------------
                 Based on the estimated wages and reported opportunity cost of time,
                ATF estimates that it will take a large retailer 32.8 hours, a midrange
                retailer 0.45 hours, and a small retailer 0.25 hours to destroy
                existing inventory. Table 10 provides the per-retailer estimated
                opportunity cost of time.
                 Table 10--Opportunity Cost of Time To Destroy Existing Inventory
                ----------------------------------------------------------------------------------------------------------------
                 Incremental Opportunity
                 Population cost Hourly burden cost of time
                ----------------------------------------------------------------------------------------------------------------
                Individual...................................................... $13.60 0.25 $3.40
                Retailer (Large)................................................ 21.34 32.8 699.95
                Retailer (Midrange)............................................. 16.84 0.45 7.58
                Retailer (Small)................................................ 19.51 0.25 4.88
                ----------------------------------------------------------------------------------------------------------------
                 As stated earlier, ATF estimates that there are 520,000 bump-stock-
                type devices already purchased by the public. For the purposes of this
                analysis, we estimate the following calculations to destroy bump-stock-
                type devices:
                 Individual: $1.3 million = (1.8 million * 75%)
                 Retailer (Large): 3 retailers * $699.95 opportunity cost of
                time + ($35,000 inventory * 75%)
                 Retailer (Midrange): 569 retailers * $7.58 opportunity cost
                of time + ($4,500 inventory * 75%)
                 Retailer (Small): 1139 retailers * $4.88 opportunity cost
                of time + ($74 inventory * 75%)
                 Based on the opportunity cost of time per bump-stock-type device,
                and the estimated opportunity cost of time per retailer, ATF provides
                the cost to destroy all existing bump-stock-type devices in Table 11.
                 Table 11--Cost of Existing Inventory and Opportunity Cost of Time To Destroy Existing Devices by Individual and
                 Retailer Size
                ----------------------------------------------------------------------------------------------------------------
                 Original cost Reduced cost Net change
                ----------------------------------------------------------------------------------------------------------------
                Individual...................................................... $1,768,000 $1,326,000 $442,000
                Retailer (Large)................................................ 142,800 80,850 61,950
                Retailer (Midrange)............................................. 3,421,252 1,924,687 1,496,565
                Retailer (Small)................................................ 116,279 66,176 50,103
                 -----------------------------------------------
                 Total Disposal Cost......................................... 5,448,330 3,397,713 2,050,618
                ----------------------------------------------------------------------------------------------------------------
                 For those abandoning bump-stock-type devices, we estimate that
                130,000 individuals, 1 large retailer, 138 midrange retailers, and 139
                small retailers will abandon them at their nearest ATF office. Table 12
                provides the cost of gas, travel time, and mileage to abandon them.
                 Table 12--Cost of Gas, Travel Time, and Mileage
                ----------------------------------------------------------------------------------------------------------------
                 Cost item Rate Source
                ----------------------------------------------------------------------------------------------------------------
                Gas Consumption................................ $0.545 https://www.gsa.gov/travel-resources.
                Hours of Weekend Travel Time................... 1.556 https://nhts.ornl.gov/2009/pub/stt.pdf.
                Miles Traveled................................. 7 https://nhts.ornl.gov/2009/pub/stt.pdf.
                ----------------------------------------------------------------------------------------------------------------
                 Assuming these devices will be abandoned during leisure hours, ATF
                uses the leisure wage rate of $13.60. ATF estimates that the cost to
                travel to ATF offices will be $24.98 per trip = (13.60 leisure wage *
                1.556 hours of weekend travel time) + ($0.545 gas consumption * 7 miles
                traveled). For the purposes of this analysis, we estimate the following
                calculations to destroy bump-stock-type devices:
                 Individual: 520,000 bump-stock-type devices * 25% * $24.98
                 Retailer (Large): (1 retailer * $24.98 travel cost) +
                ($35,000 inventory * 25%)
                 Retailer (Midrange): (190 retailers *$24.98 travel cost) +
                ($4,500 inventory * 25%)
                 Retailer (Small): (379 retailers * $24.98 travel cost) +
                ($74 inventory * 75%)
                Table 13 provides the additional cost of abandoning bump-stock-type
                devices at ATF offices.
                 Table 13--Disposal Cost To Abandon Bump-Stock-Type Devices at ATF
                 Offices
                ------------------------------------------------------------------------
                
                ------------------------------------------------------------------------
                Individual.............................................. $3,247,400
                Retailer (Large)........................................ 8,775
                Retailer (Midrange)..................................... 1,375,025
                Retailer (Small)........................................ 1,373,974
                 ---------------
                 Total Cost to Abandon............................... 6,005,174
                ------------------------------------------------------------------------
                [[Page 66551]]
                 We treat all costs of disposal of existing devices owned by
                individuals or held in inventory by retailers or manufacturers as if
                they occur in 2018. Therefore, the disposal costs of the rule in 2018
                would include the total undiscounted value of existing stock of bump-
                stock-type devices and the total cost of disposal from Tables 11 and 13
                for the total disposal cost of $9.4 million.
                Government Costs
                 Because ATF allows bump-stock-type device owners to abandon these
                devices at ATF offices, ATF incorporates the government cost to dispose
                of these devices. ATF estimates that an agent at a GS-13 level will
                dispose of the device in 0.25 hours at a loaded wage rate of $41.07 per
                hour.\27\ ATF anticipates that it will cost $1.3 million to destroy
                these devices in-house.
                ---------------------------------------------------------------------------
                 \27\ Office of Personnel Management, Salary Table 2018-GS,
                https://www.opm.gov/policy-data-oversight/pay-leave/salaries-wages/salary-tables/pdf/2018/GS_h.pdf.
                ---------------------------------------------------------------------------
                 Overall, ATF estimates that the total cost of this final rule would
                be $312.1 million over a 10-year period of future analysis. This cost
                includes the first-year cost to destroy all existing bump-stock-type
                devices, including unsellable inventory and opportunity cost of time.
                Table 14 provides the 10-year cost of this final rule.
                 Table 14--10-Year Cost of Final Rule
                ----------------------------------------------------------------------------------------------------------------
                 Year Undiscounted 3% 7%
                ----------------------------------------------------------------------------------------------------------------
                2018............................................................ 133,101,942 129,225,186 124,394,338
                2019............................................................ 19,893,303 18,751,346 17,375,581
                2020............................................................ 19,893,303 18,205,190 16,238,861
                2021............................................................ 19,893,303 17,674,942 15,176,505
                2022............................................................ 19,893,303 17,160,138 14,183,650
                2023............................................................ 19,893,303 16,660,328 13,255,748
                2024............................................................ 19,893,303 16,175,076 12,388,549
                2025............................................................ 19,893,303 15,703,957 11,578,083
                2026............................................................ 19,893,303 15,246,560 10,820,639
                2027............................................................ 19,893,303 14,802,485 10,112,746
                 -----------------------------------------------
                 Total....................................................... 312,141,666 279,605,207 245,524,700
                Annualized Cost................................................. .............. 32,778,260 34,957,194
                ----------------------------------------------------------------------------------------------------------------
                The total 7% discounted cost is $249.6 million, and the annualized
                discounted costs would be $32.8 million and $35.0 million annualized at
                3% and 7% respectively.
                Cost Savings
                 ATF did not calculate any cost savings for this final rule.
                Benefits
                 As reported by commenters, the purpose of this rule is to amend ATF
                regulations to clarify that bump-stock-type devices are ``machineguns''
                as defined by the NFA and GCA. Additionally, a desired outcome of this
                rule is increased public safety. While there has been only one known
                shooting involving bump-stock-type devices, banning such devices could
                result in reduced casualties as a consequence of reducing incidents of
                shootings involving a weapon fitted with a bump-stock-type device. A
                ban also could result in less danger to first responders when
                responding to incidents, because it prevents shooters from using
                devices that allow them to shoot semiautomatic firearms automatically.
                Alternatives
                 Alternative 1--No change alternative. This alternative would leave
                the regulations in place as they currently stand. Since there would be
                no changes to regulations, there would be no cost, savings, or benefits
                to this alternative.
                 Alternative 2--Patronizing a shooting range. Individuals wishing to
                experience shooting a ``full-auto'' firearm could go to a shooting
                range that provides access to lawfully registered ``pre-1986''
                machineguns to customers, where the firearm remains on the premises and
                under the control of the shooting range. ATF does not have the
                information to determine which, where, or how many gun ranges provide
                such a service and is therefore not able to quantify this alternative.
                 Alternative 3--Opportunity alternatives. Based on public comments,
                individuals wishing to replicate the effects of bump-stock-type devices
                could also use rubber bands, belt loops, or otherwise train their
                trigger finger to fire more rapidly. To the extent that individuals are
                capable of doing so, this would be their alternative to using bump-
                stock-type devices.
                 Public comments from the NPRM suggested other alternatives:
                 1. Provide amnesty or ``grandfathering.'' This alternative was
                rejected because since the passage of 18 U.S.C. 922(o), amnesty
                registration of machineguns is not legally permissible; all devices
                determined to be machineguns are prohibited except as provided by
                exceptions established by statute.
                 2. Provide licensing and background checks. This alternative was
                rejected because only Congress can add a new class of firearm to the
                GCA and impose licensing or acquisition requirements on it.
                 3. Provide compensation for the destruction of the devices. This
                alternative was rejected because only Congress has the authority to
                offer monetary compensation.
                 4. Provide a medical exemption. This alternative was rejected
                because neither the NFA nor the GCA provides for medical exemptions
                to acquire an otherwise prohibited firearm. Only Congress can add
                medical exemptions.
                 5. Prohibit only future manufacture and sales. This alternative
                was rejected because ATF does not have the authority to restrict
                only the future manufacture or sale of bump-stock-type devices.
                 6. Provide a quota. This alternative was rejected because ATF
                lacks authority to implement it, as all devices determined to be
                machineguns are prohibited across the board.
                 7. Institute a tax. This alternative was rejected because ATF
                lacks authority to establish excise taxes.
                 8. Improve security at mass events. This alternative was
                rejected because improved security must be paired with reasonable
                regulations to increase public safety and reduce violent crime.
                 9. Congressional legislation. This alternative was rejected
                because issuance of this rule will not prevent Congress from taking
                action on bump-stock-type devices.
                 10. Leave the issue to the States. This alternative was rejected
                because ATF is responsible for implementing the NFA and GCA, Federal
                laws designed to maintain public safety. Issuance of this rule will
                not
                [[Page 66552]]
                prevent States from taking action on bump-stock-type devices.
                 11. Improved law enforcement capabilities. This alternative was
                rejected because while training and equipment may assist law
                enforcement efforts, they are not a substitute for the Department's
                exercise of its public safety responsibility of interpreting the NFA
                and GCA appropriately.
                B. Executive Order 13132
                 This regulation will not have substantial direct effects on the
                States, the relationship between the Federal Government and the
                States, or the distribution of power and responsibilities among the
                various levels of government. Therefore, in accordance with section
                6 of Executive Order 13132 (Federalism), the Attorney General has
                determined that this regulation does not have sufficient federalism
                implications to warrant the preparation of a federalism summary
                impact statement.
                C. Executive Order 12988
                 This regulation meets the applicable standards set forth in
                sections 3(a) and 3(b)(2) of Executive Order 12988 (Civil Justice
                Reform).
                D. Regulatory Flexibility Act (RFA)
                Summary of Findings
                 ATF performed a Final Regulatory Flexibility Analysis of the
                impacts on small businesses and other entities from the final rule.
                Based on the information from this analysis, ATF found:
                 It is estimated that the remaining manufacturer will go
                out of business;
                 There are 2,281 retailers, of which most are estimated
                to be small;
                 There are no relevant government entities.
                Final Regulatory Flexibility Analysis
                 The Regulatory Flexibility Act (RFA) establishes ``as a principle
                of regulatory issuance that agencies shall endeavor, consistent with
                the objectives of the rule and of applicable statutes, to fit
                regulatory and informational requirements to the scale of the
                businesses, organizations, and governmental jurisdictions subject to
                regulation. To achieve this principle, agencies are required to solicit
                and consider flexible regulatory proposals and to explain the rationale
                for their actions to assure that such proposals are given serious
                consideration.'' Pub. L. 96-354, section 2(b), 94 Stat. 1164 (1980).
                 Under the RFA, the agency is required to consider if this rule will
                have a significant economic impact on a substantial number of small
                entities. Agencies must perform a review to determine whether a rule
                will have such an impact. If the agency determines that it will, the
                agency must prepare a regulatory flexibility analysis as described in
                the RFA.
                 Under the RFA (5 U.S.C. 604(a)), the final regulatory flexibility
                analysis must contain:
                 A statement of the need for, and objectives of, the
                rule;
                 A statement of the significant issues raised by the
                public comments in response to the initial regulatory flexibility
                analysis, a statement of the assessment of the agency of such
                issues, and a statement of any changes made in the proposed rule as
                a result of such comments;
                 The response of the agency to any comments filed by the
                Chief Counsel for Advocacy of the Small Business Administration in
                response to the proposed rule, and a detailed statement of any
                change made to the proposed rule in the final rule as a result of
                the comments;
                 A description of and an estimate of the number of small
                entities to which the rule will apply or an explanation of why no
                such estimate is available;
                 A description of the projected reporting,
                recordkeeping, and other compliance requirements of the rule,
                including an estimate of the classes of small entities that will be
                subject to the requirement and the type of professional skills
                necessary for preparation of the report or record; and
                 A description of the steps the agency has taken to
                minimize the significant economic impact on small entities
                consistent with the stated objectives of applicable statutes,
                including a statement of the factual, policy, and legal reasons for
                selecting the alternative adopted in the final rule and why each one
                of the other significant alternatives to the rule considered by the
                agency that affect the impact on small entities was rejected.
                 The RFA covers a wide range of small entities. The term ``small
                entities'' comprises small businesses, not-for-profit organizations
                that are independently owned and operated and are not dominant in their
                fields, and governmental jurisdictions with populations of less than
                50,000. 5 U.S.C. 601(3)-(6). ATF determined that the rule affects a
                variety of large and small businesses (see the section below titled ``A
                description of and an estimate of the number of small entities to which
                the rule will apply or an explanation of why no such estimate is
                available''). Based on the requirements above, ATF prepared the
                following regulatory flexibility analysis assessing the impact on small
                entities from the rule.
                A Statement of the Need for, and Objectives of, the Rule
                 Agencies take regulatory action for various reasons. One of the
                reasons is to carry out Congress's policy decisions, as expressed in
                statutes. Here, this rulemaking aims to apply Congress's policy
                decision to prohibit machineguns. Another reason underpinning this
                regulatory action is the failure of the market to compensate for
                negative externalities caused by commercial activity. A negative
                externality can be the byproduct of a transaction between two parties
                that is not accounted for in the transaction. This final rule is
                addressing a negative externality. The negative externality of the
                commercial sale of bump-stock-type devices is that they could be used
                for criminal purposes. This poses a public safety issue, which the
                Department is trying to address.
                A Statement of the Significant Issues Raised by the Public Comments in
                Response to the Initial Regulatory Flexibility Analysis, a Statement of
                the Assessment of the Agency of Such Issues, and a Statement of Any
                Changes Made in the Proposed Rule as a Result of Such Comments
                 Several commenters suggested that this rule will devastate
                companies that manufacture bump-stock-type devices and the local
                communities that they employ. The Department concurs that this rule
                will prevent manufacturers of bump-stock-type devices from producing
                and selling them. Based on publicly available information, the
                Department estimates that there is only one manufacturer actively
                producing and selling such devices. For the purposes of this rule, it
                is considered a small business. Due to the requirements of the NFA,
                there are no alternatives that are scalable by business size for this
                rule.
                 Some commenters suggested that the RFA requires agencies to
                consider the innovative impacts that small businesses have on the
                firearms market. ATF interprets the RFA's usage of ``innovation'' in
                terms of regulatory approaches that the agency could use to allow for
                small businesses to compete against non-small businesses. As there are
                no non-small businesses that manufacture bump-stock-type devices, ATF
                was unable to determine any regulatory approaches that would allow
                small manufacturers to compete with non-small businesses with respect
                to manufacturing bump-stock-type devices.
                The Response of the Agency to Any Comments Filed by the Chief Counsel
                for Advocacy of the Small Business Administration in Response to the
                Proposed Rule, and a Detailed Statement of Any Change Made to the
                Proposed Rule in the Final Rule as a Result of the Comments
                 There were no comments filed by the Chief Counsel for Advocacy of
                the Small Business Administration in response to the proposed rule.
                Therefore, no
                [[Page 66553]]
                changes were made to the proposed rule in the final rule as a result of
                comments.
                A Description of and an Estimate of the Number of Small Entities to
                Which the Rule Will Apply or an Explanation of Why No Such Estimate Is
                Available
                 This rule would affect primarily manufacturers of bump-stock-type
                devices, FFLs that sell bump-stock-type devices, and other small
                retailers of firearm accessories that have invested in the bump-stock-
                type device industry. Based on publicly available information, there is
                one manufacturer affected. Of the known retailers, the large retailers
                do not intend to continue selling bump-stock-type devices. There may be
                some small retailers that would have intended to continue selling these
                devices had this final rule not been promulgated and would thus be
                affected by this final rule. Based on the information from this
                analysis, ATF found:
                 There is 1 manufacturer who is likely to be a small
                entity;
                 There are 2,270 retailers who are likely to be small
                entities;
                 There are no government jurisdictions affected by this
                final rule; and
                 There are no nonprofits found in the data.
                A Description of the Projected Reporting, Recordkeeping and Other
                Compliance Requirements of the Rule, Including an Estimate of the
                Classes of Small Entities Which Will Be Subject to the Requirement and
                the Type of Professional Skills Necessary for Preparation of the Report
                or Record
                 There are no reporting or recordkeeping requirements for this final
                rule. The only relevant compliance requirement consists of disposing of
                all existing inventory of bump-stock-type devices for small entities
                that carry them. There would not be any professional skills necessary
                to record or report in this final rulemaking.
                A Description of the Steps the Agency Has Taken to Minimize the
                Significant Economic Impact on Small Entities Consistent With the
                Stated Objectives of Applicable Statutes, Including a Statement of the
                Factual, Policy, and Legal Reasons for Selecting the Alternative
                Adopted in the Final Rule and Why Each One of the Other Significant
                Alternatives to the Rule Considered by the Agency Which Affect the
                Impact on Small Entities Was Rejected
                 Alternatives were considered in this final rule. Alternatives
                include making no regulatory changes. ATF rejected this alternative
                because it would not be consistent with ATF's interpretation of the
                statutory term ``machinegun.'' There were no other regulatory
                alternatives to this proposal that ATF has been able to identify that
                accomplish the objective of this final rule.
                E. Small Business Regulatory Enforcement Fairness Act of 1996
                 This rule is a major rule as defined by section 251 of the Small
                Business Regulatory Enforcement Fairness Act of 1996, 5 U.S.C. 804.
                This rule is likely to be considered major as it is economically
                significant and is projected to have an effect of over $100 million on
                the economy in at least the first year of the rule.
                F. Congressional Review Act
                 This rule is a major rule as defined by the Congressional Review
                Act, 5 U.S.C. 804. This rule is likely to be considered major as it is
                economically significant and is projected to have an effect of over
                $100 million on the economy in at least the first year of the rule's
                existence.
                G. Unfunded Mandates Reform Act of 1995
                 This rule will not result in the expenditure by State, local, and
                tribal governments, in the aggregate, or by the private sector, of $100
                million or more in any one year, and it will not significantly or
                uniquely affect small governments. Therefore, no actions were deemed
                necessary under the provisions of the Unfunded Mandates Reform Act of
                1995, Public Law 104-4, 109 Stat. 48.
                H. Paperwork Reduction Act of 1995
                 This final rule does not impose any new reporting or recordkeeping
                requirements under the Paperwork Reduction Act, 44 U.S.C. 3501-3521.
                Disclosure
                 Copies of the final rule, proposed rule, and comments received in
                response to the proposed rule will be available for public inspection
                through the Federal eRulemaking portal, http://regulations.gov, or by
                appointment during normal business hours at: ATF Reading Room, Room 1E-
                062, 99 New York Ave. NE, Washington, DC 20226; telephone: (202) 648-
                8740.
                List of Subjects
                27 CFR Part 447
                 Administrative practice and procedure, Arms and munitions,
                Chemicals, Customs duties and inspection, Imports, Penalties, Reporting
                and recordkeeping requirements, Scientific equipment, Seizures and
                forfeitures.
                27 CFR Part 478
                 Administrative practice and procedure, Arms and munitions, Customs
                duties and inspection, Exports, Imports, Intergovernmental relations,
                Law enforcement officers, Military personnel, Penalties, Reporting and
                recordkeeping requirements, Research, Seizures and forfeitures,
                Transportation.
                27 CFR Part 479
                 Administrative practice and procedure, Arms and munitions, Excise
                taxes, Exports, Imports, Military personnel, Penalties, Reporting and
                recordkeeping requirements, Seizures and forfeitures, Transportation.
                Authority and Issuance
                 Accordingly, for the reasons discussed in the preamble, 27 CFR
                parts 447, 478, and 479 are amended as follows:
                PART 447--IMPORTATION OF ARMS, AMMUNITION AND IMPLEMENTS OF WAR
                0
                1. The authority citation for 27 CFR part 447 continues to read as
                follows:
                 Authority: 22 U.S.C. 2778, E.O. 13637, 78 FR 16129 (Mar. 8,
                2013).
                0
                2. In Sec. 447.11, revise the definition of ``Machinegun'' to read as
                follows:
                Sec. 447.11 Meaning of terms.
                * * * * *
                 Machinegun. A ``machinegun'', ``machine pistol'',
                ``submachinegun'', or ``automatic rifle'' is a firearm which shoots, is
                designed to shoot, or can be readily restored to shoot, automatically
                more than one shot, without manual reloading, by a single function of
                the trigger. The term shall also include the frame or receiver of any
                such weapon, any part designed and intended solely and exclusively, or
                combination of parts designed and intended, for use in converting a
                weapon into a machinegun, and any combination of parts from which a
                machinegun can be assembled if such parts are in the possession or
                under the control of a person. For purposes of this definition, the
                term ``automatically'' as it modifies ``shoots, is designed to shoot,
                or can be readily restored to shoot,'' means functioning as the result
                of a self-acting or self-regulating mechanism that allows the firing of
                multiple rounds through a single function of the trigger; and ``single
                function of the trigger'' means a single pull of the trigger and
                analogous motions. The term ``machinegun'' includes a bump-stock-type
                device, i.e., a device that allows a semi-automatic firearm to shoot
                more than one shot
                [[Page 66554]]
                with a single pull of the trigger by harnessing the recoil energy of
                the semi-automatic firearm to which it is affixed so that the trigger
                resets and continues firing without additional physical manipulation of
                the trigger by the shooter.
                * * * * *
                PART 478--COMMERCE IN FIREARMS AND AMMUNITION
                0
                3. The authority citation for 27 CFR part 478 continues to read as
                follows:
                 Authority: 5 U.S.C. 552(a); 18 U.S.C. 921-931; 44 U.S.C.
                3504(h).
                0
                4. In Sec. 478.11, revise the definition of ``Machine gun'' by adding
                two sentences at the end of the definition to read as follows:
                Sec. 478.11 Meaning of terms.
                * * * * *
                 Machine gun. * * * For purposes of this definition, the term
                ``automatically'' as it modifies ``shoots, is designed to shoot, or can
                be readily restored to shoot,'' means functioning as the result of a
                self-acting or self-regulating mechanism that allows the firing of
                multiple rounds through a single function of the trigger; and ``single
                function of the trigger'' means a single pull of the trigger and
                analogous motions. The term ``machine gun'' includes a bump-stock-type
                device, i.e., a device that allows a semi-automatic firearm to shoot
                more than one shot with a single pull of the trigger by harnessing the
                recoil energy of the semi-automatic firearm to which it is affixed so
                that the trigger resets and continues firing without additional
                physical manipulation of the trigger by the shooter.
                * * * * *
                PART 479--MACHINE GUNS, DESTRUCTIVE DEVICES, AND CERTAIN OTHER
                FIREARMS
                0
                5. The authority citation for 27 CFR part 479 continues to read as
                follows:
                 Authority: 26 U.S.C. 5812; 26 U.S.C. 5822; 26 U.S.C. 7801; 26
                U.S.C. 7805.
                0
                6. In Sec. 479.11, revise the definition of ``Machine gun'' by adding
                two sentences at the end of the definition to read as follows:
                Sec. 479.11 Meaning of terms.
                * * * * *
                 Machine gun. * * * For purposes of this definition, the term
                ``automatically'' as it modifies ``shoots, is designed to shoot, or can
                be readily restored to shoot,'' means functioning as the result of a
                self-acting or self-regulating mechanism that allows the firing of
                multiple rounds through a single function of the trigger; and ``single
                function of the trigger'' means a single pull of the trigger and
                analogous motions. The term ``machine gun'' includes a bump-stock-type
                device, i.e., a device that allows a semi-automatic firearm to shoot
                more than one shot with a single pull of the trigger by harnessing the
                recoil energy of the semi-automatic firearm to which it is affixed so
                that the trigger resets and continues firing without additional
                physical manipulation of the trigger by the shooter.
                * * * * *
                 Dated: December 18, 2018.
                Matthew G. Whitaker,
                Acting Attorney General.
                [FR Doc. 2018-27763 Filed 12-21-18; 8:45 am]
                 BILLING CODE 4410-FY-P
                

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