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H.R. 1477: Undetectable Firearms Modernization Act

The text of the bill below is as of Mar 2, 2021 (Introduced).



1st Session

H. R. 1477


March 2, 2021

(for herself, Mr. Langevin, Ms. Jackson Lee, Mr. Cohen, Ms. Norton, Ms. Scanlon, Mr. Trone, Ms. Houlahan, Mr. Blumenauer, Mr. Raskin, Mr. Swalwell, Mrs. McBath, Mr. Soto, Mr. Cárdenas, Mr. Michael F. Doyle of Pennsylvania, Ms. Wilson of Florida, Ms. Schakowsky, Mr. Cicilline, Mr. Carson, Ms. Garcia of Texas, Mrs. Carolyn B. Maloney of New York, Mr. Huffman, Mr. Malinowski, Mr. Hastings, Mr. McNerney, Mr. Norcross, Mr. Grijalva, Mr. Khanna, and Mr. Schneider) introduced the following bill; which was referred to the Committee on the Judiciary


To modernize the Undetectable Firearms Act of 1988.


Short title

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


Modernization of the prohibition on undetectable firearms

Section 922(p) of title 18, United States Code, is amended—


in paragraph (1)—


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


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;


in paragraph (2)—


by striking subparagraph (B) and inserting the following:


the term major component, with respect to a firearm—


means the slide or cylinder, or the frame or receiver of the firearm; and


in the case of a rifle or shotgun, includes the barrel of the firearm; and

; and


by striking subparagraph (C) and the proviso that follows and inserting the following:


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.



in paragraph (3)—


in the first sentence, by inserting after of a firearm the following: , including a prototype,; and


by striking the second sentence; and


in paragraph (5), by striking shall not apply to any firearm which and all that follows and inserting the following: “shall not apply to—


any firearm received by, in the possession of, or under the control of the United States; or


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.