Caliber: .223 Remington / 5.56mm NATO - Barrel: Fluted 20 Stainless Steel - Matte Finish with Thread Protector - Action: Semi-Automatic Gas Impingement System - Barrel Material: Precision 416R Stainless Steel - Capacity: 5 + 1 - Ships with one 5 Round Magazine (Accepts All Standard Sizes) - Rifling: 1 in 8 - Right Hand Twist - Safety: Manual Lever with Indicator Markings on Both Sides of Receiver - Stock: LUTH MBA-1 - Receiver: Flat Top Upper Receiver - Forend: 15 Windham Weaponry Aluminum M-LOK Free Float - Receiver Material: Forged 7075 T6 Aircraft Aluminum with Aluminum Trigger Guard - Pistol Grip: Hogue Rubber Pistol Grip - Receiver Finish: Hardcoat Anodize Finish - Rear Sight: None - Ready for Optics on 1913 Rail - Chamber: Compass Lake Spec. with Matched Bolt - Front Sight: None - Ready for Optics on 1913 Rail - Trigger: Standard Mil-Spec Trigger - Weight: 8.40 lbs. without magazine - Bolt Material: Carpenter 158 Steel - Length: 38.1875 - Includes: Hard Plastic Gun Case with Black Web Sling & Operators Manual