Guardians of the Stars
A submachine gun (SMG) is an air-cooled, magazine-fed, automatic carbine designed to fire pistol cartridges. There are some inconsistencies in the classification of submachine guns. Some sources refer to SMGs as “machine pistols” because they fire pistol-caliber ammunition. However, the term “machine pistol” is also used to describe a handgun-style firearm capable of fully automatic or burst fire. Some compact assault rifles are also referred to as SMGs, because they are used in the submachine gun role. In addition, Personal Defence Weapons (PDW) are also commonly referred to as submachine guns.