Entry-level M&P 15 without chrome lining and forward assist on early models. The best-selling AR-15 in Smith & Wesson's catalog. Type: Carbine Action: Semi-Automatic Caliber: 5.56x45mm NATO Capacity: 15 Year introduced: 2012, USA Weight: 112 oz Overall length: 32" Status: Active Intended use: Sport Shooting, Home Defense