Free-float tactical M&P 15 with Troy Industries quad-rail handguard and 16-inch chrome-lined barrel. S&W's duty-grade patrol carbine. Type: Carbine Action: Semi-Automatic Caliber: 5.56x45mm NATO Capacity: 15 Year introduced: 2008, USA Weight: 118 oz Overall length: 32" Status: Active Intended use: Law Enforcement, Tactical, Sport Shooting