The M&P 15-22 Performance Center is a factory-upgraded variant of the AR-pattern .22 LR featuring an 18-inch fluted heavy barrel, two-stage trigger, and upgraded furniture for competition use. Type: Rifle Action: Semi-Auto Caliber: .22 LR Capacity: 25 Year introduced: 2012, USA Weight: 6 oz Overall length: 35" Status: Active Intended use: Competition/Training