The Bergmann MP18/I Submachine Gun is a germany-made select-fire submachine gun chambered in 9mm Luger, introduced in 1918. Primary use: military. Type: Submachine Gun Action: Select-Fire Caliber: 9mm Luger Capacity: 25 Year introduced: 1918, Germany Weight: 112 oz Overall length: 32" Status: Discontinued Military use: Yes Intended use: military