Technical Specifications: SKU: 811036, Model: M&P15 Sport, Caliber: 5.56 mm NATO / .223, Capacity: 30 Round Detachable Magazine, Action: Semi-Auto, Barrel Length: 16", Barrel Twist: 1 in 9", Front Sight: Adjustable A2 Post, Rear Sight: Magpul® Folding MBUS, Barrel: 1 MOA, Overall Length: 35" Extended / 32" Collapsed, Stock: 6 Position Telescopic, Handguard: Full Float Yankee Hill, Weight: 6.45 lbs. Barrel Material: 4140 Steel, Receiver Material: 7075 T6 Aluminum, Receiver Finish: Hard Coat Black Anodized, Chromed Components: Gas Key, Bolt Carrier.