Important disclaimer: ATF rules on partially complete receivers have been subject to significant regulatory changes and ongoing litigation. The status described here reflects early 2026 information but may have changed. Verify current ATF guidance before making any decisions based on this post.

ATF's 2022 Rule on Frames and Receivers

In 2022, ATF issued a final rule (Rule 2021R-05F) that significantly expanded the definition of frame or receiver under federal firearms regulations. The rule addressed partially complete frames and receivers, establishing that items that may readily be converted into functional frames or receivers — including many products previously marketed as 80% receivers — could be regulated as firearms.

Litigation and Ongoing Uncertainty

The 2022 rule has been subject to significant legal challenges. Court decisions have affected whether and how the rule applies in various circumstances. Dealers should monitor current ATF guidance and consult legal counsel when uncertain about the status of specific products.

What This Means for Dealers

If a product is classified as a firearm under current ATF guidance, all standard FFL transfer requirements apply — Form 4473, NICS check, bound book entry.

When in doubt, treat it as a firearm. If you are uncertain whether a specific partially complete receiver requires FFL transfer procedures, the safest approach is to treat it as a firearm. The cost of an unnecessary transfer procedure is zero. The cost of failing to treat a regulated item as a firearm is significant.

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