The MPX SBR with 8-inch barrel is the NFA short-barreled rifle version of the MPX, offering the rotating-bolt piston 9mm platform in its most compact rifle configuration. Standard law enforcement SWAT issue at numerous agencies. Type: Rifle Action: Semi-Automatic Caliber: 9mm Luger Capacity: 30 Year introduced: 2015, USA Weight: 5.9 oz Overall length: 25" Status: Active Intended use: law_enforcement, duty, suppressor_host