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.

Short recoil is a firearm operating mechanism where the barrel and slide move together for a short distance after firing, then separate to complete extraction, ejection, and chambering.