United States · Bill · HR
H.R. 4221 (119th)
Undetectable Firearms Modernization Act
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
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.
This text is taken from the official record. PoliticalRepo does not editorialize.
Timeline
27 June 2025
Introduced
Referred to the House Committee on the Judiciary.
Source: IntroReferral
27 June 2025
Introduced
Introduced in House
Source: IntroReferral
27 June 2025
Introduced
Introduced in House
Source: IntroReferral
Votes
No vote records are attached yet.
Versions
No version snapshots stored. Document URLs remain at the source.
Documents
2 official files
Introduced in House
Introduced in House
Introduced in House · EN · 27 June 2025
Introduced in House
summary · EN · 27 June 2025
Sponsors
- Madeleine Dean · D · Sponsor
- · hsju00 · Standing
Related records
No cross-record relationships stored yet.
Sources
PoliticalRepo is an index and interpretation layer, not the authoritative legal source.
- Official source: https://www.congress.gov/bill/119th-congress/house-bill/4221
- Open data entity: https://api.congress.gov/v3/bill/119/hr/4221
- us · 119-hr-4221 · source updated 18 March 2026