Updated Sport version of the M&P15-22 trainer with an Armornite-treated barrel, optics-ready receiver, and Magpul MOE stock. Internally it uses a straight blowback .22 LR mechanism housed in an AR-15-profile receiver for familiar manual-of-arms training. Type: Semi-Auto Rifle Action: Gas-Operated Caliber: .22 LR Capacity: 25 Year introduced: 2015, USA Weight: 5.3 oz Overall length: 35" Status: Active Intended use: Training, Range, Plinking