Caliber: .223 Remington/5.56 NATO - Barrel Material: 4150 Chrome Moly Vanadium 11595E Steel with M4 Feed Ramps - Action: Semi-Automatic Gas Impingement System - Rifling: 1 in 7 - Right Hand Twist - Capacity: 30 + 1 - Ships with one 30 Round Magazine (Accepts All Standard Sizes) - Stock: A2 Solid Stock with Trapdoor Storage Compartment - Safety: Manual Lever with Indicator Markings on Both Sides of Receiver - Forend: Rifle-Length Triangular Handguard with A1 Delta Ring - Receiver: A1 Upper With Brass Deflector and Teardrop Forward Assist - Pistol Grip: A1 Black Pistol Grip - Receiver Material: Forged 7075 T6 Aircraft Aluminum with Aluminum Trigger Guard - Rear Sight: A1 Dual Aperture Rear Sight - Receiver Finish: Hardcoat Black Anodize Finish - Front Sight: Adjustable Height Square Post in A2 Standard Base - Trigger: Standard Mil-Spec Trigger - Weight: 7.45 lbs. without magazine - Bolt Material: Carpenter 158 Steel - Length: 39.5 - Barrel: 20 A2 Profile - Chrome-Lined with A1 Flash Suppressor - Includes: Hard Plastic Gun Case with Black Web Sling & Operators Manual