The M&P15T is a Tactical-configured AR-15 with a free-float Troy quad-rail handguard, A2 front sight base, and flat-top receiver. Positioned above the Sport II for users who need full-length rail space for multiple accessories. Type: Semi-Auto Rifle Action: Gas-Operated Caliber: 5.56x45mm Capacity: 30 Year introduced: 2006, USA Weight: 6.9 oz Overall length: 35" Status: Active Intended use: Tactical, Patrol, Range