H.R. 4221

[Congressional Bills 119th Congress]
[From the U.S. Government Publishing Office]
[H.R. 4221 Introduced in House (IH)]

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119th CONGRESS
1st Session
H. R. 4221

To modernize the Undetectable Firearms Act of 1988.

_______________________________________________________________________

IN THE HOUSE OF REPRESENTATIVES

June 27, 2025

Ms. Dean of Pennsylvania introduced the following bill; which was 
referred to the Committee on the Judiciary

_______________________________________________________________________

A BILL

To modernize the Undetectable Firearms Act of 1988.

Be it enacted by the Senate and House of Representatives of the 
United States of America in Congress assembled,

SECTION 1. SHORT TITLE.

This Act may be cited as the ``Undetectable Firearms Modernization 
Act''.

SEC. 2. MODERNIZATION OF THE PROHIBITION ON UNDETECTABLE FIREARMS.

Section 922(p) of title 18, United States Code, is amended--
(1) in paragraph (1)--
(A) in subparagraph (A), by striking ``grips, 
stocks, and magazines, is not as detectable as the 
Security Exemplar, by walk-through metal detectors 
calibrated and operated to detect the Security 
Exemplar'' and inserting ``all parts other than major 
components, does not contain detectable material''; and
(B) in subparagraph (B), by striking ``when 
subjected to inspection by the types of x-ray machines 
commonly used at airports, does not generate'' and 
inserting the following: ``if subjected to inspection 
by the types of detection devices commonly used at 
airports for security screening, would not generate'';
(2) in paragraph (2)--
(A) by striking subparagraph (B) and inserting the 
following:
``(B) the term `major component', with respect to a 
firearm--
``(i) means the slide or cylinder, or the frame or 
receiver of the firearm; and
``(ii) in the case of a rifle or shotgun, includes 
the barrel of the firearm; and''; and
(B) by striking subparagraph (C) and the proviso 
that follows and inserting the following:
``(C) the term `detectable material' means material that 
produces a magnetic field that is equivalent in strength to the 
magnetic field produced by 3.7 ounces of 17-4 PH stainless 
steel.'';
(3) in paragraph (3)--
(A) in the first sentence, by inserting 
after ``of a firearm'' the following: ``, 
including a prototype,''; and
(B) by striking the second sentence; and
(4) in paragraph (5), by striking ``shall not apply to any 
firearm which'' and all that follows and inserting the 
following: ``shall not apply to--
``(A) any firearm received by, in the possession of, or 
under the control of the United States; or
``(B) the manufacture, importation, possession, transfer, 
receipt, shipment, or delivery of a firearm by a licensed 
manufacturer or licensed importer pursuant to an existing 
contract with the United States.''.
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