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UnavailableCaliber .223/5.56 x 45 mm NATO Weight Weight (unloaded): 5 lbs. 6oz. Upper Receiver CORE15® Mil-Spec Forged 7075-T6 M-4 Upper Receiver, Type III Class II Hard-coat anodized finish, M4 Feed Ramps, (1913 Picatinny rail flat top) w/ 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 Group CORE15® Mil-Spec Carpenter 158 steel bolt, M16 Chrome Lined 8620 Steel Carrier, Mil-Spec Staked Gas Key, Tool Steel Extractor, Shot Peened Buffer Tube KAK Industries Pistol Buffer Tube (Ready for SIG SAUER® SB15 Pistol Stabilizing Brace) Charging Handle CORE15® Hardcore Billet Charging Handle V.2 Barrel/Rifling CORE15® 10.5” 1:7 Twist 4150 CMV Carbine Length Gas System Black Nitride Finish Flash Hider Midwest Industries Flash Hider Rail System CORE15® Keymod 9.5 ” Rail Grip Ergo Swift Grip Trigger Guard CORE15® Oversized Trigger Guard Magazine Magpul® 30 rd. PMAG® Details