H.R. 2799 — Closing the Bump Stock Loophole Act of 2025

This section amends the Gun Control Act (Chapter 44 of title 18, U.S. Code) to (1) define "semiautomatic firearm" in 18 U.S.C. §921(a)(31) as a non-machinegun that uses a firing cartridge's energy to extract the spent case, chamber the next round, and prepare to fire again, while requiring separate trigger action per shot; (2) prohibit, 120 days after enactment, any person from importing, selling, manufacturing, transferring, receiving, or possessing in or affecting interstate or foreign commerce (A) manual, power-driven, or electronic attachments (i.e., bump stocks and similar devices) that materially increase a semiautomatic firearm's rate of fire or approximate a machinegun; (B) parts or combinations eliminating separate trigger movements to increase rate of fire; or (C) modified semiautomatic firearms with such capabilities, subject to exceptions for government entities and grandfathered pre-enactment modified firearms if registered under specified procedures; require owners of pre-enactment modified semiautomatic firearms to register them within 120 days under Internal Revenue Code §5841; and add the new prohibition to criminal penalties in 18 U.S.C. §924(a)(2); and (3) amend National Firearms Act definitions in Internal Revenue Code §5845(a) to classify modified semiautomatic firearms (as described) as "firearms," subjecting registered items to NFA requirements (i.e., taxation, registration, and restrictions). (Thus, the changes effectively ban new production and unregulated possession of such devices and modifications while allowing continued possession of compliant pre-enactment items.)