On June 13, 2024, U.S. District Judge Reed O’Connor vacated the ATF’s AR pistol brace rule, noting that it violated the Administrative Procedure Act (APA).

The ATF pistol brace rule targets stabilizer braces attached to AR pistols, claiming the braces turn AR pistols into short barrel rifles (SBRs). And since SBRs are regulated under the National Firearms Act (1934), the ATF issued its rule on AR-pistol braces to stop what it saw as a way around SBR regulations.