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DOJ/ATF RIN: 1140-AA55 Publication ID: Fall 2021 
Title: Factoring Criteria for Firearms With an Attached Stabilizing Brace 

The Department of Justice is planning to propose to amend the regulations of the Bureau of Alcohol, Tobacco, Firearms, and Explosives to set forth factors considered when evaluating firearms with an attached stabilizing brace to determine whether they are considered firearms under the National Firearms Act and/or the Gun Control Act.

Agency: Department of Justice(DOJ)  Priority: Other Significant 
RIN Status: Previously published in the Unified Agenda Agenda Stage of Rulemaking: Final Rule Stage 
Major: No  Unfunded Mandates: No 
CFR Citation: 27 CFR 478    27 CFR 479   
Legal Authority: 18 U.S.C 921 to 931    26 U.S.C 5812    26 U.S.C 5822    26 U.S.C. 7801    26 U.S.C. 7805   
Legal Deadline:  None

Statement of Need:

This rule is intended to clarify when a rifle is intended to be fired from the shoulder and to set forth factors that ATF considers when evaluating firearms with an attached purported stabilizing brace to determine whether these are rifles under the GCA or NFA, and therefore whether they are firearms subject to the NFA. It amends the definition of rifle in 27 CFR 478.11 and 479.11, respectively, by adding a sentence at the end of each definition. The new sentence would clarify that the term rifle includes any weapon with a rifled barrel and equipped with an attached stabilizing brace that has objective design features and characteristics that indicate that the firearm is designed to be fired from the shoulder, as indicated on ATF Worksheet 4999.

Summary of the Legal Basis:

The Attorney General has express authority pursuant to 18 U.S.C. 926 to prescribe rules and regulations necessary to carry out the provisions of chapter 44, title 18, United States Code. The detailed legal analysis supporting the amendments in this rule are expressed in the abstract for the rule itself.


There are no feasible alternatives to the proposed rule that would allow ATF to maximize benefits.

Anticipated Costs and Benefits:

The rule is a significant regulatory action that is economically significant under section 3(f) of Executive Order 12866, because the rule will have an annual effect on the economy of $100 million or more. The annualized cost of this proposed rule would be $114.7 million and $125.7 million, at 3 percent and 7 percent, respectively. This proposed rule would affect attempts by manufacturers and individuals to circumvent the requirements of the NFA and would affect the criminal use of weapons with a purported stabilizing brace.


Without this rule, public safety will continue to be threatened by the criminal use of such firearms, which are easily concealable from the public and first responders.

Action Date FR Cite
NPRM  06/10/2021  86 FR 30826   
NPRM Comment Period End  09/08/2021 
Final Action  08/00/2022 
Regulatory Flexibility Analysis Required: No  Government Levels Affected: None 
Small Entities Affected: Businesses  Federalism: No 
Included in the Regulatory Plan: Yes 
International Impacts: This regulatory action will be likely to have international trade and investment effects, or otherwise be of international interest.
RIN Data Printed in the FR: No 
Agency Contact:
Denise Brown
Regulations Writer
Department of Justice
Bureau of Alcohol, Tobacco, Firearms, and Explosives
99 New York Avenue NE,
Washington, DC 20226
Phone:202 648-7070