Referred to the Subcommittee on Crime, Terrorism, Homeland Security, and Investigations.
Congressional Research Service
Official summary
Version 00 · Introduced in House · Apr 6, 2017
Undetectable Firearms Modernization Act
This bill amends the Undetectable Firearms Act of 1988 to revise what are prohibited firearms to include any firearm: (1) that, after removal of all parts other than major components is not as detectable by walk-through metal detectors as the Security Exemplar (an object fabricated for the testing and calibration of metal detectors); or (2) any major component of which, if subjected to inspection by the types of detection devices commonly used at airports for security screening, would not generate an image that accurately depicts the shape of the component.
The bill modifies the definition of: (1) "major component" to include the barrel of a firearm only in the case of a rifle or shotgun, and (2) "Security Exemplar" to repeal the requirement that it be fabricated within 12 months after enactment of such Act.
Showing the opening paragraphs of the official summary.
Read full official summaryShow less
The bill exempts from undetectable firearms provisions: (1) a prototype firearm for detectability testing; (2) any firearm received by, in the possession of, or under the control of the United States; or (3) 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. (This replaces the exemption of any firearm that has been certified by the Department of Defense or the Central Intelligence Agency as necessary for military or intelligence applications or that is manufactured and sold exclusively to U.S. military or intelligence agencies.)
Source last updated: Aug 11, 2025. Consult Congress.gov for the current record.
AI Conversation Starters
Explore the bill from different angles
Choose a perspective, copy a prompt, and paste it into your preferred AI. Each prompt includes the bill version and available official source links, and asks for counterarguments as well as supporting evidence.
Neutral evidence review
Objective
Analyze H.R.2033 as objectively as possible. Explain its main provisions, who would be affected, possible benefits and harms, implementation, exceptions, and uncertainties. Present the strongest arguments for and against it, and identify evidence needed to assess its public impact.
View full prompt & sources
Fairness and public impact
Progressive lens
Examine H.R.2033 through a progressive lens, focusing on fairness, access, economic inequality, and effects on vulnerable communities. Explain potential benefits, costs, and unintended consequences. Consider the strongest counterarguments and distinguish stated goals from demonstrated outcomes.
View full prompt & sources
Institutions and government scope
Conservative lens
Examine H.R.2033 through a conservative lens, focusing on fiscal responsibility, institutional stability, federalism, and the scope of government. Explain potential benefits, costs, and unintended consequences. Consider the strongest counterarguments and any provisions that challenge this perspective.
View full prompt & sources
Individual rights and government power
Liberty lens
Examine H.R.2033 through a civil-liberties and limited-government lens. Consider individual rights, privacy, voluntary choice, accountability, and government power. Explain tradeoffs, possible safeguards, and the strongest counterarguments without assuming the proposal is beneficial or harmful.