Weight: 6 lbs. 5 oz. (unloaded) - Caliber: Chambered in .223/5.56 x 45 mm NATO - Upper Receiver: CORE15® Mil-Spec Forged 7075-T6 M-4 Upper Receiver Type III Class II Hardcoat anodized finish M4 Feed Ramps (1913 Picatinny rail flat top) with dry lube internal finish and laser engraved T-markings - Lower Receiver:CORE15® Mil-Spec Forged 7075- T6 Lower Receiver Type III Class II Hard-coat anodized finish beveled Magwell for improved reloading speed machined chevrons in front of magazine well bullet pictogram safety markings - Bolt Carrier: CORE15® Mil-Spec Carpenter 158 Steel Bolt M16 Chrome Lined 8620 Steel Carrier Mil-Spec Staked Gas Key Tool Steel Extractor Shot Peened - Charging Handle: CORE15® Hardcore Billet Charging Handle V.1 - Buffer Tube: CORE15® Standard Mil-Spec - Gas Tube: Gas Tube made of 304 grade Stainless Steel - Gas Block: CORE15® Low Profile Gas Block - Rail System: CORE15® Keymod 12.5 Rail - Barrel: CORE15®16 Mid-length Profile 1:7 Twist 4150 Black Nitride Finish - Flash Hider: A-2 Flash Hider - Grip: A-2 Pistol Grip - Stock: CORE15® Six Position Retractable Stock (Mil-Spec) - Trigger Guard: CORE15® Oversized Trigger Guard - Magazine: MFT (Mission First Tactical) 30 rd. Magazine