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PART NUMBER 14045 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 304 Grade Stainless Steel BARREL CORE15® 16" Government Profile 1:9 Twist, 4150 Black Nitride Finish FLASH HIDER A-2 Flash Hider SIGHTS A Frame Front Sight Base (Forged) HANDGUARD M4 Sty