A bayonet lug is a metal fitting on the barrel or muzzle of a firearm that provides a mounting point for a bayonet.

Firearm configuration where the action and magazine are located behind the trigger, reducing overall length while maintaining barrel length.

Ammunition in which the propellant is encased in a combustible or consumable material, eliminating the traditional metal cartridge case.

A firearm feed system where ammunition is stored in a separate container (magazine) that can be removed and replaced, enabling rapid reloading.

Firearm action type where expanding gas from a fired cartridge cycles the mechanism, typically via a piston or direct impingement.

Uses high-pressure gas to cycle the action, rather than recoil energy.

Select fire is a fire selector mechanism on a firearm that lets the shooter choose the firing mode, such as semi‑automatic, burst, or fully automatic.