The original M&P15-22 is an AR-15-form-factor .22 LR trainer with a blowback action housed in polymer-enhanced receivers. Introduced to give AR owners a low-cost training analog with identical controls and ergonomics to the M&P15 centerfire series. Type: Semi-Auto Rifle Action: Gas-Operated Caliber: .22 LR Capacity: 25 Year introduced: 2009, USA Weight: 5.3 oz Overall length: 35" Status: Active Intended use: Training, Range, Plinking