H.R. 4221
119th Congress
Undetectable Firearms Modernization Act
0
Cosponsors
3
Actions
0
Amendments
0
Committees
—
Since introduced
Referred to the House Committee on the Judiciary.
27 June 2025·1 year ago
Summary
Introduced in House · Updated 18 March 2026
Undetectable Firearms Modernization Act
This bill strengthens the detectability standard for firearms under federal firearms laws.
Current law requires firearms to be detectable by walk-through metal detectors after the removal of grips, stocks, and magazines. Specifically, firearms must be as detectable as a security exemplar (i.e., a piece of stainless steel that is 3.7 ounces and in a shape resembling a handgun). There are exceptions, including for firearms manufactured for or sold to U.S. military or intelligence agencies.
This bill requires firearms to contain detectable material after the removal of all parts other than major components. It defines detectable material as material that produces a magnetic field equivalent to that produced by 3.7 ounces of stainless steel. The bill also revises and broadens the exceptions to include firearms (1) received by, in the possession of, or under the control of the United States; or (2) produced pursuant to a contract with the United States.
Timeline
3 actions
Referred to the House Committee on the Judiciary.
27 June 2025 · IntroReferral
Introduced in House
27 June 2025 · IntroReferral
Introduced in House
27 June 2025 · IntroReferral
Sponsorship
0 cosponsors
Sponsor
Democrat:Rep. Dean, Madeleine [D-PA-4]PAClassification
Policy area
Crime and Law EnforcementTrack Undetectable Firearms Modernization Act as it moves through Congress
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