Caliber: .223 Rem. / 5.56mm NATO - Barrel Material: 4150 Chrome Moly Vanadium 11595E Steel with M4 Feed Ramps - Action: Semi-Automatic Gas Impingement System - Rifling: 1 in 9 Right Hand Twist - Capacity: 30 + 1 Ships with one 30 Round Magazine (Accepts All Standard Sizes) - Stock: Magpul CTR Carbine Stock with Magpul ASAP QD Single Point Receiver End Plate - Safety: Manual Lever with Indicator Markings on Both Sides of Receiver - Forend: 15 Windham Weaponry Aluminum M-LOK Free Float with Magpul M-LOK Hand Stop - Receiver: Flat Top Upper Receiver - Pistol Grip: Magpul MOE Black Pistolgrip with Storage Compartment - Receiver Material: Forged 7075 T6 Aircraft Aluminum with Magpul Enhanced Trigger Guard - Rear Sight: Magpul MBUS Pro Metal Rear Sight - Receiver Finish: Hardcoat Black Anodize Finish - Front Sight: Magpul MBUS Pro Metal Front Sight - Trigger: Standard Mil-Spec Trigger - Weight: 6.95 lbs. without magazine - Bolt Material: Carpenter 158 Steel - Length: 36.125