The M&P15-22 Pistol uses a shorter 8-inch barrel and pistol brace on the same dedicated .22 LR platform, creating an AR-pistol training analog that shares controls and layout with centerfire AR pistols. Type: Pistol Action: Semi-Automatic Caliber: .22 LR Capacity: 25 Year introduced: 2014, USA Weight: 44 oz Overall length: 22" Status: Active Intended use: Training, Plinking, Range