Congress·In Committee·H.R. 4221
Undetectable Firearms Modernization Act
Gun Safety: Updates to the Ban on Undetectable Firearms
Legislative Progress
House
Key Points
- This bill updates a 1988 law to ensure that modern firearms, like those made with 3D printers, can’t sneak through security. It requires every gun to have a major component—like the frame or barrel—that shows up clearly on airport X-ray machines and metal detectors.
- To make the rules clearer, the bill defines "detectable" as having the same magnetic strength as 3.7 ounces of stainless steel. This prevents people from making plastic guns that are invisible to standard security equipment used at airports and government buildings.
- The new rules would also apply to prototypes, which are early test versions of guns. This ensures that designers cannot claim a plastic gun is just a test model to avoid following the law.
- Guns made specifically for the U.S. military or federal law enforcement are exempt from these rules. This allows the government to continue using specialized equipment for national security purposes.
Impact Analysis
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Milestones
2 milestones2 actions
Jun 27, 2025
Referred to the House Committee on the Judiciary.
Jun 27, 2025
Introduced in House
The bill was officially filed and given a number. It now enters the legislative queue.
Votes
No votes have been recorded for this legislation yet.
News
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Source Information
Document Type
Congressional Bill
Official Title
Undetectable Firearms Modernization Act
Bill NumberHR 4221
Congress119th Congress
ChamberHouse of Representatives
Latest ActionReferred to the House Committee on the Judiciary.
Data Sources
Sponsor
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