According to the North Atlantic Treaty Organization (NATO), small arms are weapons intended for use by an individual and include rifles, pistols, assault rifles, submachine guns, and light machine guns. On the other hand, light weapons are used by two or more persons serving as a crew and include grenade launchers, heavy machine guns, anti-aircraft guns, mortars, and anti-tank guns. All these light weapons are less than 100 mm in caliber. The rapidly changing nature of... (GunPolicy.org)