Federal Judge Rules ATF Frame-or-Receiver Rule Unconstitutional

Legal disclaimer:
This article is for general informational purposes only and is not legal advice. Firearm laws can vary by state and local jurisdiction, and court decisions may change as cases are appealed. Readers should check current laws and, when necessary, consult a qualified attorney before making legal decisions.

What Was the ATF Frame-or-Receiver Rule?

The ATF issued its new frame-or-receiver rule in 2022. The rule changed how the federal government decides whether unfinished frames, receivers and firearm parts kits count as “firearms” under the Gun Control Act of 1968.

Firearms sold by licensed dealers must generally have serial numbers and be covered by records and background-check requirements. Manufacturers and dealers must also follow federal licensing rules when handling products that qualify as firearms.

For example, imagine a nearly finished polymer pistol frame sold with the parts needed to build a working handgun. If the frame already had most of its important cavities and pin holes, and the kit included the slide, barrel, trigger assembly and other key parts, the ATF could treat the package as a regulated firearm instead of ordinary unfinished material.

Selling that kit without the required markings, records and background checks could then lead to federal enforcement.

The rule focused on products that could be turned into working firearms with additional machining or assembly. That included some products commonly called “80% receivers,” along with kits containing most of the parts needed to build a firearm.

Important: “80% receiver” is an industry term. There is no simple federal rule saying that a receiver becomes a firearm at exactly 80%, 81% or any other percentage of completion.

Instead, the ATF looked at whether an unfinished item could “readily” be completed or changed into a working frame or receiver. The agency could consider factors such as the time, difficulty, tools, skill and work needed to finish it.

That word, “readily,” became one of the main issues in the new court ruling.

Didn’t the Supreme Court Already Uphold This Rule?

Yes, but the Supreme Court answered a different question.

In March 2025, the Supreme Court ruled 7-2 in Bondi v. VanDerStok that the Gun Control Act allows the ATF to regulate at least some unfinished frames, receivers and firearm parts kits. The Court overturned an earlier decision that said the rule went beyond the ATF’s legal authority.

The Supreme Court used a Polymer80 handgun kit as an example. An ordinary person could turn the kit into a working firearm in a short time with common tools. The majority said Congress gave the ATF enough authority to treat some products like that as firearms.

But the Supreme Court did not decide every possible challenge to the rule. Its decision focused on whether the ATF had authority under the Gun Control Act. It did not decide whether the rule violated the Constitution.

That distinction matters: The 2025 Supreme Court case addressed the ATF’s statutory authority. The 2026 Texas ruling addressed surviving constitutional challenges under the Second and Fifth Amendments.

That left room for another lawsuit. Defense Distributed and the Second Amendment Foundation returned to the lower court with constitutional arguments.

The Second Amendment Question

O’Connor found that the ATF rule puts an unconstitutional burden on Americans who want to make or repair their own firearms. He said personal gunsmithing has deep roots in American history and is connected to conduct protected by the Second Amendment.

Under the Supreme Court’s current Second Amendment test, the government generally must show that a gun restriction fits with the country’s historical tradition of firearm regulation. O’Connor found that the government had not shown a similar historical tradition for the restrictions created by the 2022 rule.

The government pointed to older laws involving gun barrel inspections and the storage or transportation of gunpowder. O’Connor said those laws were not similar enough to justify the modern frame-and-receiver rule.

Instead, the court focused on the long history of Americans building and repairing their own firearms. O’Connor wrote that private firearm manufacturing was common in American history and said the 2022 rule conflicts with that tradition.

This part of the ruling could matter beyond this case. If other courts adopt similar reasoning, laws restricting home gunsmithing could face stronger Second Amendment challenges.

The Court Also Found the Rule Too Vague

The court found another problem under the Fifth Amendment’s Due Process Clause. According to O’Connor, the ATF’s method for deciding when an unfinished piece of metal or polymer becomes a regulated firearm does not give people a clear enough answer.

The rule lets the ATF consider several factors when deciding whether an item can “readily” be completed into a frame or receiver. Those factors can include the time, difficulty, skill, equipment, parts, cost and work involved.

The court said the rule does not clearly explain when an unfinished object crosses the line and becomes a federally regulated firearm. That uncertainty matters even more because violations of federal gun laws can lead to criminal penalties.

The Supreme Court had already recognized some of this uncertainty. In a concurring opinion in the 2025 case, Justice Brett Kavanaugh said people acting in good faith might have trouble knowing whether certain unfinished products qualified as firearms.

O’Connor concluded that the rule did not give people enough notice and gave the ATF too much control over where the legal line should be drawn. He therefore found the challenged provisions unconstitutionally vague under the Fifth Amendment.

Does This Mean 80% Lowers Are Legal Everywhere?

No. The limits of the ruling are important.

O’Connor did not issue a nationwide order removing every federal restriction on unfinished receivers. The permanent injunction blocks enforcement of the challenged provisions against Defense Distributed, the Second Amendment Foundation and SAF’s current or future members with respect to Defense Distributed’s M1911 80% Frames and G80 Build Kit, Unfinished Receiver and Grip Module.

The ruling should not be read as a court order saying that every unfinished frame, receiver or firearm kit in the country is exempt from federal regulation.

The Supreme Court’s 2025 decision still matters, too. The Court said Congress gave the ATF authority to regulate at least some unfinished frames and receivers, especially products that are nearly complete and can become working firearm components with little additional work.

Simple version: The Supreme Court said the ATF can regulate at least some unfinished firearms products under the Gun Control Act. The Texas court said the ATF’s current regulatory approach violates constitutional protections as applied in this case. Those conclusions address different legal questions.

What About State Laws?

The ruling does not automatically strike down state laws regulating privately made firearms, unfinished receivers or unserialized firearms. State restrictions remain in place unless a court blocks them or lawmakers change them.

However, O’Connor’s Second Amendment reasoning could give gun-rights groups new arguments when challenging those laws. Future courts may consider the Texas court’s conclusion that making and repairing personal firearms are protected activities with a strong historical tradition in the United States.

Other federal courts do not have to agree with O’Connor. The case could also be appealed to the Fifth Circuit and possibly return to the Supreme Court.

Check your jurisdiction:
Federal litigation does not override every state or local restriction. Before buying, possessing, manufacturing or transferring an unfinished frame, receiver or privately made firearm, check the laws that currently apply where you live.

What Happens Next?

The ruling adds another step to a legal fight that has lasted several years. The ATF won an important victory in the Supreme Court in 2025, but that decision did not settle the constitutional questions O’Connor addressed.

For gun owners, builders and firearm businesses, the safest takeaway is that the legal status of unfinished receivers remains complicated. The new ruling is an important challenge to the ATF’s 2022 rule, but it is not a nationwide declaration that every product sold as an “80% lower” falls outside federal firearms law.

The case may be most important for the principle behind it. A federal court has now said that Americans’ long-standing ability to make and repair their own firearms deserves Second Amendment protection. The court also said the government must give people a clear legal standard before imposing criminal penalties.