Bill · H.R. 4221· House(119-HR-4221)
Undetectable Firearms Modernization Act
- Introduced
- 6/27/2025
- Last activity
- 6/27/2025 — Referred to the House Committee on the Judiciary.
- Sponsored by
- Madeleine Dean
- Cosponsors
- None
- Introduced
- In Committee
What this bill would do
This bill, known as the Undetectable Firearms Modernization Act, seeks to update the Undetectable Firearms Act of 1988. It changes how the law defines what makes a firearm undetectable by modifying descriptions of certain parts and detection methods. The bill establishes a new definition for "detectable material" based on magnetic field strength. It also updates the definition of "major component" to include specific parts like the slide, cylinder, frame, receiver, or barrel for rifles and shotguns. Additionally, it adjusts exceptions for firearms under the control of the United States or those involving licensed manufacturers with existing contracts.
Yes
Does this put more limits on buying or owning guns?+3
The bill modernizes standards for detectable firearms to potentially enhance security screening efficacy.
The opposite
Would gun owners be better off under this?-2
The bill updates technical definitions regarding detectable components of firearms.
Who it would affect, and how
Potential Positive Impacts for People
-
Clarification of Detectable Material: Section 2, paragraph (2)(A) defines "detectable material" as material that produces a magnetic field equivalent to 3.7 ounces of 17-4 PH stainless steel. This provides a specific standard for what is considered detectable.
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Updated Security Screening Language: Section 2, paragraph (1)(A) updates the language regarding parts of a firearm to state they must contain detectable material.
Potential Negative Impacts for People
-
Changes to Major Component Definitions: Section 2, paragraph (2)(A) modifies the term "major component" to specifically include the slide, cylinder, frame, receiver, or the barrel in the case of a rifle or shotgun.
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Changes to Exceptions: Section 2, paragraph (4) alters the exceptions for the law, stating it shall not apply to firearms received by, in the possession of, or under the control of the United States, or to specific actions by licensed manufacturers or importers with existing United States contracts.
Groups and Interests Ranking
Every group the model scored this bill for, from -10 to +10. Hover a score for the reason it gave.
- Social Issues And Justice
- Improves Gun Control Measures+3
- Demographic And Interest Groups
- Good For Gun Owners-2
- 6/27/2025
- Referred to the House Committee on the Judiciary.
- Introduced in House