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Core Firearms 12091: 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 15" Rail - BARREL: CORE1516" 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: Pmag 30rd Gen II