A type of firearm action where the breech is not locked and the cartridge case expands to seal the breech, using case expansion and pressure to retain gases.

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

Integral bipod: a permanently attached, built‑in bipod that provides a two‑point support for a firearm, allowing it to be rested on a surface without separate accessories.

Adjustable metal aiming devices on firearms, consisting of a front post and rear notch, used without magnification.

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.