LEGISLATION/H.R. 4221

Undetectable Firearms Modernization Act

119-HR-4221119th CongressIntroduced Jun 27, 2025Crime and Law Enforcement
Market Probability
No market
Status
Introduced
Committee
Floor Vote
Other Chamber
Signed
Referred to the House Committee on the Judiciary.

Sponsor

Rep. Dean, Madeleine [D-PA-4](D-PA-4)

Summary

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.

Actions (3)

Referred to the House Committee on the Judiciary.
Jun 27, 2025House floor actions
Introduced in House
Jun 27, 2025Library of Congress
Introduced in House
Jun 27, 2025Library of Congress