The AR-556 MPR Pistol version of the Multi-Purpose Rifle adds a 15-inch free-float M-LOK handguard and Magpul furniture to the pistol-format AR-556, offering more mounting real estate than the standard pistol model. Type: Pistol Action: Semi-Automatic Caliber: 5.56 NATO Capacity: 30 Year introduced: 2018, USA Weight: 84 oz Overall length: 25.75" Status: Active Intended use: Home Defense, Range, Competition