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Proposed

Bill · 119th Congress · HR 4221

Undetectable Firearms Modernization Act

Refreshed 2 h ago

Introduced 2025-06-27Topic: criminal justice

Summary

Summary by the Congressional Research Service

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.

Full text and official record on Congress.gov

Sponsors

Action history

DateChamberActionStatus effect
2025-06-27HouseReferred to the House Committee on the Judiciary.refer
2025-06-27Introduced in Houseintroduce
2025-06-27Introduced in Houseintroduce
Source: GovInfo Bill Status (Library of Congress), fetched 2026-09-11. Provisions and opinion polling arrive in a later release.