Suomi KP/-31
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The Suomi KP/-31 is a Finnish submachine gun that was mainly used during World War II. It is a descendant of the M-22 prototype and the KP/-26 production model, which was revealed to the public in 1925. It entered service in Finland in 1931, and remained in use until the 1980s.
Suomi KP/-31
Finnish soldier armed with a Suomi KP/-31 SJR (muzzle brake version) and a Panzerfaust walks past a destroyed Soviet tank
Drum magazines for the KP/-31
Bunker model KP/-31
Submachine gun
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A submachine gun (SMG) is a magazine-fed automatic carbine designed to fire handgun cartridges. The term "submachine gun" was coined by John T. Thompson, the inventor of the Thompson submachine gun, to describe its design concept as an automatic firearm with notably less firepower than a machine gun. As a machine gun must fire rifle cartridges to be classified as such, submachine guns are not considered machine guns.
A Mini Uzi and a Heckler & Koch MP5K, two common submachine guns
Artillery Luger P08 pistol with snail-drum magazine and removable stock.
The FIAT Mod.1915 is considered by some to be the first submachinegun.
A Standschütze Hellriegel M1915, the first submachinegun with a buttstock, seen here with stick and drum magazines