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

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.

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

A straight, cylindrical ammunition container that feeds cartridges into a firearm's action via gravity or a spring.