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United States · Bill · HR

H.R. 4221 (119th)

Undetectable Firearms Modernization Act

referredUnited States· United States Congress· EN

Introduced

27 June 2025

Last action

27 June 2025 · Introduced

Status

Referred to the House Committee on the Judiciary.

Sponsors

Madeleine Dean

Subjects

Defence

Source updated

18 March 2026

Defence

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.

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Timeline

  1. 27 June 2025

    Introduced

    Referred to the House Committee on the Judiciary.

    Source: IntroReferral

  2. 27 June 2025

    Introduced

    Introduced in House

    Source: IntroReferral

  3. 27 June 2025

    Introduced

    Introduced in House

    Source: IntroReferral

Votes

No vote records are attached yet.

Versions

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Documents

2 official files

Introduced in House

View fileDownload file

Sponsors

Related records

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Sources

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