HOME > ATF Rules > ATF Rule 2021R-08 - Stabilizing Braces


As you would expect from the ATF, this new point system heavily favors turning just about every AR or AK pistol into an SBR. This proposed rule change was originally set to become effective in August 2022 but has been postponed and is now set to be released as a final rule December 28, 2022. Please click the link below to read the rule.

Link - ATF Rule 2021R-08 - Stabilizing Brace Ban

Link - ATF Worksheet 4999 - Stabilizing Brace

Factoring Criteria for Firearms with Attached “Stabilizing Braces”
On June 7, 2021, the Attorney General signed ATF proposed rule 2021R-08, “Factoring Criteria for Firearms with Attached ‘Stabilizing Braces,’” amending ATF’s regulations to clarify when a rifle is “intended to be fired from the shoulder.”

The proposed rule outlines the factors ATF would consider when evaluating firearms equipped with a purported “stabilizing brace” to determine whether these weapons would be considered a “rifle” or “short-barreled rifle” under the Gun Control Act of 1968, or a “rifle” or “firearm” subject to regulation under the National Firearms Act.

What is Proposed in this Rulemaking?
The proposed rule would:
Amend the definition of “rifle” in 27 CFR 478.11 and 479.11, respectively, by adding a sentence at the end of each definition to 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.
Set forth a worksheet “Factoring Criteria for Rifled Barrel Weapons with Accessories commonly referred to as ‘Stabilizing Braces,’” ATF Worksheet 4999, to aid the firearms industry and public in understanding the criteria that ATF considers when evaluating firearm samples that are submitted with an attached “stabilizing brace” or similar component or accessory.
This proposed rule would not affect “stabilizing braces” that are objectively designed and intended as a “stabilizing brace” for use by individuals with disabilities, and not for shouldering the weapon as a rifle. Such stabilizing braces are designed to conform to the arm and not as a buttstock.

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