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

A bolt action is a type of firearm action that requires the user to manually cycle the bolt to load and eject cartridges. It is uncommon in pistols.

An internal magazine is a pistol magazine that is contained within the grip and loaded from within the firearm.

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