Litigation Highlight: Legal Challenges to ATF Rule on Stabilizing Braces
In January of this year, the Bureau of Alcohol, Tobacco, Firearms, and Explosives (ATF) published Final Rule 2021R-08F, “Factoring Criteria for Firearms with Attached ‘Stabilizing Braces.’” The new rule changes the operative definition of “rifle” in the Code of Federal Regulations such that most pistols with attached stabilizing braces (often called “pistol braces”) will now be subject to heightened federal regulation under the National Firearms Act of 1934 (NFA) and the Gun Control Act of 1968 (GCA). Citizens, state attorneys general, and gun policy groups have already filed several lawsuits in federal district courts challenging the legality of ATF’s rule.
In this post, I’ll first introduce the pistol brace and the tale of historical (non)regulation, beginning with a brief table-setting history of the NFA and GCA. Second, I’ll survey the main legal arguments presented in the ongoing lawsuits, with a focus on Second Amendment challenges.
The NFA, GCA, and the “Short-Barreled Rifle” Category
The NFA, passed in 1934 in response to widely-publicized incidences of gang violence, imposed burdensome taxes, regulatory requirements, and criminal non-compliance penalties on the ownership and transfer of weapons associated with criminal use. In 1968, the GCA modified the definitions of certain weapons already regulated by the NFA and instituted a system of federal licensing for firearms distributors. Together, these two acts regulate machine guns (fully-automatic rifles like the “Tommy Gun,” infamously associated with Prohibition-era criminals); short-barreled rifles and shotguns; suppressors; destructive devices (like grenades and other explosives); and an amorphous category of “any other weapon” (now referred to as ‘AOWs,’ and understood to include ‘disguised’ firearms and firearms that don’t fit neatly into another category). Collectively, these weapons are known as “NFA items.”
More specifically, this regulatory scheme limits who may import, build, or purchase NFA items, and under what circumstances they may do so. The most onerous restriction at the time of the NFA’s passage was the $200 tax it imposed on possession of NFA items (equivalent to ~$4,500 in today’s dollars). Since the amount of this tax has not changed over the years, the tax itself is no longer the NFA’s most restrictive element. Instead, that honor now belongs to ATF’s ‘approval’ requirements, which involve extensive background checks and fingerprinting, as well as the registration of the individual NFA item with ATF. The average wait-time for an individual seeking to buy an NFA item, such as a short-barreled rifle (SBR), is estimated to be 270 days.
The NFA as originally written also regulated handguns, but a concerted lobbying effort on the part of the National Rifle Association caused lawmakers to drop handguns from the final bill. So, today, the NFA regulates neither handguns (defined in relevant part as “a firearm which has a short stock and is designed to be held and fired by the use of a single hand”) nor full-length rifles (defined in relevant part as “weapon[s] designed or redesigned, made or remade, and intended to be fired from the shoulder” and having a barrel longer than 16 inches). Since neither handguns nor full-length rifles are subject to NFA regulations, these two types of firearms are substantially easier to access than SBRs, which differ from full-length rifles only in their barrel length.



