HR-923-119
Referred to the Committee on the Judiciary, and in addition to the Committee on Ways and Means, for a period to be subsequently determined by the Speaker, in each case for consideration of such provisions as fall within the jurisdiction of the committee concerned.
Sponsored by Joaquin Castro (D-TX)
What it does
This bill would place .50 caliber rifles under the National Firearms Act, requiring registration and licensing, and would criminalize their import, sale, manufacture, transfer, and possession under the Gun Control Act. It would also make it a federal crime to sell or transfer firearms or ammunition to foreign individuals or entities designated as significant narcotics traffickers under the Kingpin Act. Finally, it would create an exception to the Protection of Lawful Commerce in Arms Act (PLCAA) allowing civil lawsuits against firearms manufacturers or sellers who knowingly sell to Kingpin Act-designated individuals or entities.
Who benefits
Mexican government and civilians who may face reduced exposure to cartel violence involving U.S.-sourced .50 caliber rifles. U.S. and Mexican law enforcement and security forces who are targeted by cartels using these weapons. Communities on both sides of the U.S.-Mexico border affected by transnational criminal organization (TCO) activity. Firearms manufacturers and sellers who already comply with export and trafficking laws, as the PLCAA exception targets only those who knowingly sell to sanctioned entities. Attorneys and plaintiffs who have been blocked from civil litigation against arms sellers under the PLCAA.
Who is hurt
Current lawful owners of .50 caliber rifles who would face new registration requirements and potential possession restrictions. Competitive long-range shooters and hunters who use .50 caliber rifles legally. Firearms manufacturers and retailers who produce or sell .50 caliber rifles, facing reduced market and new compliance costs. Firearms dealers who may face increased legal exposure under the new PLCAA exception, even if their culpability is disputed. Small gun shop owners who may lack resources to vet every buyer against Kingpin Act designation lists. Taxpayers who may bear costs of new ATF enforcement and registration infrastructure.
Supporters argue
Supporters argue that .50 caliber rifles have become weapons of choice for Mexican cartels attacking security forces, and that the U.S. is the primary source of these weapons due to lax regulation. They contend that the 2025 Supreme Court ruling in Smith & Wesson v. Estados Unidos Mexicanos exposed a gap in accountability by shielding manufacturers from civil liability even when their products foreseeably arm criminal organizations, and that the PLCAA exception closes that gap only for the most egregious knowing violations. They further argue that .50 caliber rifles have no practical civilian self-defense use and that bringing them under the National Firearms Act — as machine guns and short-barreled rifles already are — is a proportionate regulatory response to a documented cross-border security threat.
Opponents argue
Opponents argue that the bill imposes sweeping restrictions on a class of firearms used lawfully by thousands of American civilians, competitive shooters, and hunters, based on their misuse by a small number of bad actors operating outside U.S. borders. They contend that the PLCAA exception creates a litigation pathway that could be exploited to burden compliant manufacturers with costly lawsuits, since proving a seller "knowingly" sold to a sanctioned entity is a fact-intensive inquiry that invites abuse. They further argue that post-Bruen, placing an entire category of rifles under the National Firearms Act's registration and licensing regime must be grounded in historical tradition, and that no founding-era analogue exists for such broad restrictions on a class of long guns in common civilian use.
Constitutional context
The bill's restrictions on .50 caliber rifles raise Second Amendment questions under New York State Rifle & Pistol Ass'n v. Bruen (2022), which requires firearms regulations to be consistent with the historical tradition of firearms regulation — a framework further refined in United States v. Rahimi (2024). Whether .50 caliber rifles are in "common use" for lawful purposes, and whether NFA-style registration has a sufficient historical analogue, are questions that courts would likely need to resolve. The PLCAA exception also implicates due process under the Fifth Amendment, as it creates civil liability standards that manufacturers may challenge as vague or retroactive.
Checks and balances
Congress would expand executive branch (ATF) regulatory and enforcement authority over a new class of firearms; courts would serve as a check through Second Amendment challenges under the Bruen/Rahimi framework, and through adjudication of civil suits brought under the new PLCAA exception.
Historical precedent
The National Firearms Act of 1934 established the registration and licensing framework this bill would extend to .50 caliber rifles, and has been applied to machine guns, short-barreled rifles, and suppressors; courts have generally upheld NFA regulations, though the post-Bruen landscape has introduced new uncertainty for categorical firearm restrictions.