The W+F Bern SIG Bergmann MKMO SMG is a switzerland-made select-fire submachine gun chambered in 9mm Luger, introduced in 1934. Primary use: military. Type: Submachine Gun Action: Select-Fire Caliber: 9mm Luger Capacity: 25 Year introduced: 1934, Switzerland Weight: 88 oz Overall length: 24" Status: Discontinued Military use: Yes Intended use: military