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<bill bill-stage="Introduced-in-House" dms-id="H3E37B405575744D9A1D43BE892BAAF07" public-private="public" key="H" bill-type="olc"><metadata xmlns:dc="http://purl.org/dc/elements/1.1/">
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<dc:title>119 HR 4221 IH: Undetectable Firearms Modernization Act</dc:title>
<dc:publisher>U.S. House of Representatives</dc:publisher>
<dc:date>2025-06-27</dc:date>
<dc:format>text/xml</dc:format>
<dc:language>EN</dc:language>
<dc:rights>Pursuant to Title 17 Section 105 of the United States Code, this file is not subject to copyright protection and is in the public domain.</dc:rights>
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<distribution-code display="yes">I</distribution-code><congress display="yes">119th CONGRESS</congress><session display="yes">1st Session</session><legis-num display="yes">H. R. 4221</legis-num><current-chamber>IN THE HOUSE OF REPRESENTATIVES</current-chamber><action display="yes"><action-date date="20250627">June 27, 2025</action-date><action-desc><sponsor name-id="D000631">Ms. Dean of Pennsylvania</sponsor> introduced the following bill; which was referred to the <committee-name committee-id="HJU00">Committee on the Judiciary</committee-name></action-desc></action><legis-type>A BILL</legis-type><official-title display="yes">To modernize the Undetectable Firearms Act of 1988.</official-title></form><legis-body id="HF01CB60A22544034A9B01453577A1E00" style="OLC"> 
<section id="H31901D643EDB4EB2816E52EC2FD53EF5" section-type="section-one"><enum>1.</enum><header>Short title</header><text display-inline="no-display-inline">This Act may be cited as the <quote><short-title>Undetectable Firearms Modernization Act</short-title></quote>.</text></section> <section id="H9CEFCEFA986746DD8C7EE2120CE2ACBA" section-type="subsequent-section"><enum>2.</enum><header>Modernization of the prohibition on undetectable firearms</header><text display-inline="no-display-inline">Section 922(p) of title 18, United States Code, is amended—</text>
<paragraph id="H804E5C6CED2F49C08C3F60C1279AE138"><enum>(1)</enum><text display-inline="yes-display-inline">in paragraph (1)—</text> <subparagraph id="H487A79AF805D4E06A5DC320449C0E002"><enum>(A)</enum><text display-inline="yes-display-inline">in subparagraph (A), by striking <quote>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</quote> and inserting <quote>all parts other than major components, does not contain detectable material</quote>; and</text></subparagraph>
<subparagraph id="H1BCDCCCD6BE14B40AA2AEF8C70977B91"><enum>(B)</enum><text>in subparagraph (B), by striking <quote>when subjected to inspection by the types of x-ray machines commonly used at airports, does not generate</quote> and inserting the following: <quote>if subjected to inspection by the types of detection devices commonly used at airports for security screening, would not generate</quote>;</text></subparagraph></paragraph> <paragraph id="H9148CCB20BAD4AC59B818B9589B0C0FC"><enum>(2)</enum><text>in paragraph (2)—</text>
<subparagraph id="H82B273413B5B401D8B12E6359F6EE5D7"><enum>(A)</enum><text>by striking subparagraph (B) and inserting the following:</text> <quoted-block display-inline="no-display-inline" id="HC5B893B86AA54A37B09D41117A3A9095" style="OLC"> <subparagraph id="HDBB69645D36246C8B42917802F78B773" indent="up1"><enum>(B)</enum><text>the term <term>major component</term>, with respect to a firearm—</text>
<clause id="HFB52B6D0AD87414BBF2B3429B5E42679"><enum>(i)</enum><text>means the slide or cylinder, or the frame or receiver of the firearm; and</text></clause> <clause id="HAAB0372E2A5B4647B38032F34EB3D4CE"><enum>(ii)</enum><text>in the case of a rifle or shotgun, includes the barrel of the firearm; and</text></clause></subparagraph><after-quoted-block>; and</after-quoted-block></quoted-block></subparagraph>
<subparagraph id="H956E9FA8041E4312A4DB7166D5E6F00E"><enum>(B)</enum><text>by striking subparagraph (C) and the proviso that follows and inserting the following:</text> <quoted-block display-inline="no-display-inline" id="HCE91AC3D320849C1991D0073C6B16699" style="OLC"> <subparagraph id="H3D913A6B0D10468395A216B112D493BA" indent="up1"><enum>(C)</enum><text>the term <term>detectable material</term> 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.</text></subparagraph><after-quoted-block>;</after-quoted-block></quoted-block></subparagraph></paragraph>
<paragraph id="HECE26B35F7C8405EBD7CCA0A28D43DDD"><enum>(3)</enum><text>in paragraph (3)—</text> <subparagraph id="H65AF7E5F7FA9430995A797508FF6809D" indent="down1"><enum>(A)</enum><text>in the first sentence, by inserting after <quote>of a firearm</quote> the following: <quote>, including a prototype,</quote>; and</text></subparagraph>
<subparagraph id="H1D73C613A05243F1A90B5AE525354EEE" indent="down1"><enum>(B)</enum><text>by striking the second sentence; and</text></subparagraph></paragraph> <paragraph id="H72C1B2B81D214541BC1DA7D60970E671"><enum>(4)</enum><text display-inline="yes-display-inline">in paragraph (5), by striking <quote>shall not apply to any firearm which</quote> and all that follows and inserting the following:</text>
<quoted-block style="OLC" id="H5B7A4ABA0E684219A4F8B8F49288C70F" display-inline="yes-display-inline"><text>shall not apply to—</text> <subparagraph id="H2B8D29D2235346FA8BD3B391A5C47FDC" indent="up1"><enum>(A)</enum><text>any firearm received by, in the possession of, or under the control of the United States; or</text></subparagraph>
<subparagraph id="H8B48BCAE70A342C293E3B006344C3825" indent="up1"><enum>(B)</enum><text>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.</text></subparagraph><after-quoted-block>.</after-quoted-block></quoted-block></paragraph></section> </legis-body></bill>

