The world's first practical submachine gun, designed by Hugo Schmeisser during WWI for trench clearing operations. The MP18 established the submachine gun as a weapon category and influenced all subsequent designs. Type: Pistol Action: Semi-Automatic Caliber: 9mm Luger Capacity: 32 Year introduced: 1918, Germany Weight: 57.6 oz Overall length: 32.8" Status: Discontinued Military use: Yes Intended use: Military Service, Police