Guns are a type of armament, which is a military weapon or piece of equipment. WEAPONS are items used to inflict damage or harm on an enemy. Guns are a type of weapon, and they require ammunition to fire. Ammunition is the projectiles or cartridges that are loaded into the gun. ARMS are WEAPONS, such as guns, that are used in warfare. REVS are short for revolvers, which are a type of handgun. Stens are a type of submachine gun. BICEPS are the muscles in the upper arm that are used to pull the trigger of a gun. Revsup is short for revolver suppressor, which is a device that reduces the sound of a gun when it is fired.