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H.R. 4221In committee

Undetectable Firearms Modernization Act

Introduced: Jun 27, 2025

Latest action date: Jun 27, 2025

Latest development

Referred to the House Committee on the Judiciary.

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Congress
119th Congress
Introduced
Jun 27, 2025
Recorded roll calls
0

Status detail: The most advanced recorded stage is committee consideration.

Plain-language overview

What this bill does

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.

Official summary from Congress.gov.

Civixly topics

What this legislation is about

Civixly topics make federal and state legislation comparable. They are derived from the official CRS policy area and legislative subjects.

Official CRS policy area

Crime and Law Enforcement

Committee activity

Committees and subcommittees that received, reviewed, marked up, or reported this legislation.

Amendments

Proposed changes to this measure, with their latest official outcome or action from Congress.gov.

No amendments are listed for this measure.

Checked against Congress.gov Oct 12, 2026.

Action timeline

Newest action first. Action language comes from the official Congress.gov record.

View full action timeline3 actions
  1. Referred to the House Committee on the Judiciary.

    IntroReferralHouse floor actions
  2. Introduced in House

    IntroReferralLibrary of Congress
  3. Introduced in House

    IntroReferralLibrary of Congress

Roll-call votes

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Sources: Congress.gov and official House and Senate vote records.

View data freshness details

Base metadata check pending · Civixly summary check pending · Action timeline checked Oct 12, 2026 · Complete sponsorship check pending · Topics checked Oct 12, 2026 · Committees checked Oct 12, 2026 · Status checked Oct 12, 2026 · Related bills checked Oct 12, 2026.