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Core Firearms 13548 CRS13548: Caliber: Chambered in .223/5.56 x 45 mm NATO - Weight: 5 lb. 14 oz. (2.67 kg) Unloaded - 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 V.2 - Buffer Tube: CORE15 Standard Mil-Spec - GAS Tube: 304 Grade Stainless Steel - Barrel: CORE15 14.5" Pencil Profile 1:7 Twist 4150 Carbine Length Gas System Black Nitride Finish - Rail System: CORE15 Keymod 12.5" Rail - Flash Hider: Yankee Hill Phantom (Pin & Welded) - Grip: Ergo Black Suregrip - Stock: MFT Minimalist Stock - Trigger Guard: CORE15 Oversized Trigger Guard - Magazine: MFT (Mission First Tactical) 30rd. Magazine