Features Include: SKU: 811300, Model: M&P15 300 Whisper, Caliber: .300 Whisper, .300 AAC Blackout, Capacity: 10 Rounds - Metal Magazine, Action: Semi-Auto, Barrel Length: 16" / 40.6 cm, Barrel Twist: 1 in 7.5" 5R Rifling, Overall Length: 35" Extended / 32" Collapsed, Stock: 6 Position CAR, Weight: 6.38 lbs. (2,889.4 g), Barrel Material: 4140 Steel, Barrel Finish: Durable, Corrosion Resistant Barrel Finish, Receiver Material: 7075 T6 Aluminum, Receiver Finish: Realtree APG, Chromed Components: Gas Key, Bolt Carrier.