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H.R. 4221: Undetectable Firearms Modernization Act

119th Congress · introduced 2025-06-27 · Crime and Law Enforcement · Latest: Referred to the House Committee on the Judiciary.

federal

What does this mean?

Official title

Undetectable Firearms Modernization Act

Plain 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.

Congressional Research Service summary (Introduced in House), quoted unchanged (nonpartisan). Read the source.

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A “Nay” vote

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PSI Sci description of the legislative step (not an opinion).

What does this mean? (plain words)

Official text

Undetectable Firearms Modernization Act

Source: Congressional Research Service summary (Introduced in House)

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Officials and money

Sponsor: Rep. Dean, Madeleine [D-PA-4] · 0 cosponsors

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Words on this page, explained (2)
Bill
A proposed law. It becomes law only if it passes the legislature and is signed by the president or governor (or a veto is overridden).
Securities
Financial investments that can be bought and sold, such as stocks and bonds.

Plain meanings written from linked sources. All words.

Sources

Record fed-us-cong119-hr4221 · catalog fed-us-congress-bills-cong119 · updated 2026-11-03 by psicol fed-bills