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

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

A pistol feature allowing it to fire grenades or projectile rounds.

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

A mounting system for attaching optical sights to rifles.

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.

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.

A pistol barrel with external helical grooves allowing the attachment of a suppressor or other muzzle devices.