Closing the Bump Stock Loophole Act of 2025

If passed, this bill will criminalize possession of the most commonly available rate-of-fire conversion devices (bump stocks, crank triggers) and force owners of pre-enactment modified firearms into a registration system (similar to the National Firearms Act registry for fully automatic weapons and suppressors). Compliance will likely be moderate to high based on the 2018 Trump-era bump stock ban, which achieved approximately 90% voluntary compliance within the 90-day surrender period. Gun owners who do not register or surrender modified firearms face up to 10 years imprisonment and fines under section 924(a)(2) penalties. The bill will reduce the civilian supply of rapid-fire capable semiautomatic firearms but will not affect the estimated 20+ million semiautomatic firearms already in civilian hands; owners may retain unmodified versions. Historical precedent: the 2018 federal bump stock ban (enacted via ATF administrative action) produced widespread compliance and no documented significant enforcement difficulties, though it also produced no measurable reduction in mass shooting incidents (Las Vegas and other mass shootings continued post-ban). The 1994 Federal Assault Weapons Ban (which included a rapid-fire mechanism provision) showed compliance rates of 60-80% over 10 years; this bill's registration requirement may increase compliance beyond the 2018 bump stock ban.