- Potential benefitReduces availability of aftermarket devices that increase semiautomatic firearms' rate of fire.
- Federal agenciesIncreases federal traceability by requiring registration of pre-existing modified semiautomatic firearms.
- Potential benefitAligns statutory definitions with enforcement against conversion devices previously treated as loopholes.
Closing the Bump Stock Loophole Act of 2025
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 conside…
This bill amends federal law to ban devices and modifications that materially increase the rate of fire of semiautomatic firearms or approximate machinegun action. It prohibits import, sale, manufacture, transfer, receipt, or possession of such devices and newly modified firearms, with a 120-day effective period.
Progressives emphasize public-safety gains and closing loopholes
Relative to its intended legislative type, this bill creates substantive criminal prohibitions and statutory definitions and integrates them into the National Firearms Act framework.
This bill amends federal law to ban devices and modifications that materially increase the rate of fire of semiautomatic firearms or approximate machinegun action.
It prohibits import, sale, manufacture, transfer, receipt, or possession of such devices and newly modified firearms, with a 120-day effective period.
Owners of semiautomatic firearms modified before enactment must register those firearms under the National Firearms Act within 120 days.
Substantive firearm restriction with registration obligations is politically and procedurally difficult despite targeted scope and some compromise language.
Relative to its intended legislative type, this bill creates substantive criminal prohibitions and statutory definitions and integrates them into the National Firearms Act framework. It supplies timing, exceptions, and a registration pathway but relies on indeterminate standards and omits fiscal, procedural, and oversight detail that would be expected for a change that expands registration and enforcement obligations.
Progressives emphasize public-safety gains and closing loopholes
Who stands to gain, and who may push back.
These are examples from the analysis, not a ranked list of the most-affected groups.
- Potential burdenRequires owners to register covered modified firearms within 120 days, imposing compliance burdens.
- Potential burdenUses vague terms like "materially increases" and "approximates" creating regulatory uncertainty.
- ManufacturersImposes costs on manufacturers, sellers, and owners from registration, legal, and compliance activities.
Why the argument around this bill splits.
Progressives emphasize public-safety gains and closing loopholes
Likely broadly supportive: views the bill as closing a loophole that allowed bump stocks and similar conversion devices.
Sees NFA registration for pre-existing modified firearms as improving accountability and public safety.
May wish the bill went further on other high-capacity modifications.
Cautiously favorable if narrowly and clearly implemented.
Values the law’s aim to stop conversion devices while wanting precise definitions and a manageable registration process.
Concerned about administrative costs and unintended consequences.
Likely opposed: sees the bill as federal overreach that expands NFA scope and burdens lawful gun owners.
Views the definitions as overly broad, risking criminalizing ordinary accessories and property rights without compensation.
The path through Congress.
Reached or meaningfully advanced
Reached or meaningfully advanced
Still ahead
Still ahead
Still ahead
Substantive firearm restriction with registration obligations is politically and procedurally difficult despite targeted scope and some compromise language.
- No cost estimate or CBO score provided
- How 'materially increases' will be legally interpreted
Recent votes on the bill.
No vote history yet
The bill has not accumulated any surfaced votes yet.
Go deeper than the headline read.
Progressives emphasize public-safety gains and closing loopholes
Substantive firearm restriction with registration obligations is politically and procedurally difficult despite targeted scope and some com…
Relative to its intended legislative type, this bill creates substantive criminal prohibitions and statutory definitions and integrates them into the National Firearms Act framework. It supplies timing, exceptions, and…
Go beyond the headline summary with full stakeholder mapping, legislative design analysis, passage barriers, and lens-by-lens tradeoff breakdowns.