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1:9 ***** CORE15 Mil-Spec Forged 7075-T6 M-4 Upper and Lower Receiver, Type III Class II Hard-coat anodized finish, M4 feed ramps, (1913 Picatinny rail flat top) with dry lube internal finish and laser engraved T-markings. 16" 4150 Chrome Moly M4 profile Chrome Lined Barrel 1:9 Twist, Chambered in .223/5.56 x 45 mm NATO, Direct Gas Impingement Gas System. Action Semi-Automatic Caliber 223 Remington/5.56 NATO Barrel Length 16" Capacity 30+1 Trigger Standard Safety Lever OAL 35.5" Weight 5.2 lbs Stock Description 6-Position Black Metal Finish Black Muzzle A2 Flash Hider Receiver Material Aluminum Sights A2 Front Barrel Description 4150 Chrome Moly Vanadium Chrome-Lined **********Twist 1:9"********** Barrel Length Range 16.00" to 17.99" Weight Range 4.00 lbs to 5.99 lbs Hand Right Stock Finish Group Synthetic Metal Finish Group Blued/Black