The SIG MPX is a 9mm submachine gun designed for law enforcement and military use, featuring a short-stroke gas piston system (unusual in a 9mm SMG) and a folding stock. It accepts standard Glock 17 pattern magazines in one configuration. The MPX competes with the MP5 as a modern replacement platform. Type: Submachine Gun Action: Semi/Full-Auto Caliber: 9mm Capacity: 30 Year introduced: 2013, Germany Weight: 89.6 oz Overall length: 22.5" Status: Active Intended use: law_enforcement, civilian