Antibump

Antibump refers to devices or design approaches intended to reduce, slow, or prevent bump firing in semi-automatic firearms. Bump firing is a technique that uses recoil and movement of the shooter's body to cycle the action rapidly, producing a rate of fire higher than typical semi-automatic fire. Antibump solutions are marketed as safety or control devices and aim to limit the firearm's ability to be operated in a bump-fire manner without altering the fundamental semi-automatic mechanism.

Most antibump implementations involve mechanical constraints that reduce free movement of the trigger or the firearm's stock relative to the shooter's shoulder. Examples include triggers or grips with built-in friction, blocks that limit trigger reset, and stocks or braces that restrict the amount of rearward travel during firing. Some designs work by increasing resistance to the motion required for rapid cycling, thereby making bump-fire firing impractical while preserving normal, intentional firing.

Legal and regulatory context varies widely. In the United States, laws specific to bump firing evolved after 2017-2018 events; some jurisdictions ban bump stocks or regulate similar devices, and antibump devices may be treated as safety devices or as parts subject to weapon laws. In other countries, firearm regulations may impose different standards or ban modifications altogether. Assertions about efficacy and safety are mixed, and prospective buyers are advised to consult local laws and credible testing data.

See also: bump stock; firearm safety devices; trigger discipline; firearm regulation.