The M&P15-22 Sport is a dedicated .22 LR rifle in the full-size AR-15 layout, not a conversion kit, using a simple blowback action and 25-round magazine with all external AR controls. Type: Rifle Action: Semi-Automatic Caliber: .22 LR Capacity: 25 Year introduced: 2010, USA Weight: 47 oz Overall length: 35" Status: Active Intended use: Training, Plinking, Range