Closed-bolt, short-stroke gas-piston 9mm carbine with a 16-inch barrel. The MPX is unique among PCCs in using a gas-piston rotating bolt system rather than blowback, offering AR-15-like recoil characteristics in a 9mm platform. Type: Rifle Action: Semi-Automatic Caliber: 9mm Capacity: 30 Year introduced: 2015, USA Weight: 6.7 oz Overall length: 36" Status: Active Intended use: Patrol / Range / Home Defense