Supreme Court hears arguments over ATF rule treating 'ghost-gun' kits and unfinished receivers as firearms

The Supreme Court heard argument in Garland v. Vanderstock (No. 23852), a challenge to an ATF regulation that treats certain parts kits and partially finished frames or receivers as "firearms" under the Gun Control Act of 1968.

General Prelogar, arguing for the government, told the Court the statute requires firearms sellers and manufacturers to mark products with serial numbers, maintain sales records and conduct background checks, and that recent products marketed as "kits" allowed consumers to produce functional guns in minutes "with no serial number, background check, or records required." She said the ATF rule simply applies the long‑standing textual test—whether a product can be "readily converted" to function—and explicitly accounts for jigs and templates that make conversion fast and essentially "dummy proof." "Those untraceable guns are attractive to people who can't lawfully purchase them or who plan to use them in crimes," she said, arguing the rule targets the commercial market that supplied such weapons.

Respondent counsel, Mister Patterson, told the justices ATF had exceeded the agency's authority by expanding "frame or receiver" to reach items that are only readily convertible or are collections of parts rather than a distinct component. Patterson urged the Court to adopt either a bright‑line test that an item must be essentially complete or a "critical machining operations" test focused on whether essential manufacturing steps have occurred. He warned that the government's approach could sweep in ordinary items or regulators could import the "readily convertible" concept into unrelated statutory provisions.

The bench focused on three fault lines: (1) textual scope—whether an undefined noun like "frame" should be read to include nearly complete components that require minor finishing; (2) precedent and agency practice—whether ATF's decades of classification letters support the agency's present approach; and (3) enforcement risk—how mens rea (the statute's willfulness knowledge requirement) and ATF classification procedures protect good‑faith sellers from criminal liability.

Justices probed hypotheticals: would a single drilled hole determine the line between regulated and unregulated items? Could an AR‑15 lower that could be converted into a machine‑gun receiver be swept in? Prelogar said the rule requires a "clearly identifiable unfinished component part" before the readily‑convertible inquiry applies and that mens rea protections in 18 U.S.C. § 924(a) guard against unwarranted prosecutions. Patterson countered that retaining "readily convertible" for frames collapses distinctions the statute draws and urged reliance on the critical‑machining approach.

On evidence of harm, Prelogar cited the administrative record and told the Court the market for ghost guns "essentially collapsed" after the rule's implementation; she also told the Court the record shows a sharp increase in recovered ghost guns, telling the bench there was a "1,000% increase between 2017 and 2021" in such recoveries. Patterson disputed aspects of the government's portrayal of the market and emphasized the burden on lawful manufacturers and hobbyists.

The arguments touched on separation‑of‑powers concerns as well: whether the Court's role is to choose the best interpretation among alternatives or to determine whether the agency has exceeded statutory authority. Both sides framed the dispute as an interpretive one about what Congress meant in 1968.

After extended questioning from multiple justices, the government delivered a rebuttal and the case was submitted.

The Court's eventual decision will resolve whether ATF's regulation is a permissible construction of the Gun Control Act that targets commercially marketed kits and unfinished receivers, or whether the agency has reached beyond statutes enacted by Congress.