Enhanced tactical AR-15 with an 18-inch barrel, quad-rail handguard, and 5-position collapsible stock. The longer barrel improves velocity over the Sport and Trooper variants. Marketed as the enhanced tactical configuration in the M&P 15 line. Type: Rifle Action: Semi-Automatic Caliber: 5.56 NATO Capacity: 30 Year introduced: 2008, USA Weight: 26.1 oz Overall length: 37" Status: Active Intended use: Recreational Shooting, Home Defense