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HR 4221 119th Congress

Undetectable Firearms Modernization Act

To modernize the Undetectable Firearms Act of 1988.

Official Title as Introduced Congress.gov

Introduced Jun 27, 2025 Latest action Jun 27, 2025 Sponsor: Rep. Dean, Madeleine [D-PA-4] Crime and Law Enforcement
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Source: Congress.govUpdated 2026-08-03 11:15:40 UTC.

Source-linked procedural record

Bill journey

5 dated records

This is a chronology, not a progress score. Politically.com does not classify stages or infer what comes next. Records sharing a date are grouped because not every source field supplies a time.

Congress.gov Recently refreshed U.S. Senate XML Recently refreshed
Introduction 1 One supplied introduction date.
Official actions 3 3 dated action records.
Committees 1 1 undated relationship.
Amendments 0 No record is cached.
Text versions 1 1 dated, 0 without a supplied date.
House roll calls 0 No exact legislation-key match in the House-vote cache.
Senate roll calls 0 No exact document-key match in the Senate-vote cache.
Related measures 0 No related-measure relationship is cached.
Linked law 0 No linked law record is cached; this does not predict outcome.

  1. Official action Congress.gov

    Referred to the House Committee on the Judiciary.

    IntroReferral · House floor actions · Code H11100

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    Official action Congress.gov

    Introduced in House

    IntroReferral · Library of Congress · Code Intro-H

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    Official action Congress.gov

    Introduced in House

    IntroReferral · Library of Congress · Code 1000

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    Text version Congress.gov

    Introduced in House

    A dated text-version record is available.

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View the complete bill journey as an accessible table
Every dated cached record linked to HR 4221. Same-date row order does not assert procedural sequence.
Date and timeRecordOfficial detailSource
IntroductionIntroduced Introduced in the House. Congress.gov
Official actionReferred to the House Committee on the Judiciary. No additional detail supplied.IntroReferral · House floor actions · Code H11100 Congress.gov
Official actionIntroduced in House No additional detail supplied.IntroReferral · Library of Congress · Code Intro-H Congress.gov
Official actionIntroduced in House No additional detail supplied.IntroReferral · Library of Congress · Code 1000 Congress.gov
Text versionIntroduced in House A dated text-version record is available. Congress.gov

House roll calls join only on matching Congress, legislation type, and number. Senate roll calls join only on matching source-supplied document type and number, not question text. Committee and related-measure relationships have no date in their relationship records and therefore are counted above but never placed on the chronology.

Congressional Research Service

CRS summary

Introduced in House Jun 27, 2025

Undetectable Firearms Modernization ActThis 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 documents

Text versions