Description Additional Information Description 5" 5.56 1:5 Twist 4150 Barrel 4150 Chrome Moly Vanadium Medium Profile QPQ Corrosion Resistant Coating Micro Gas System .750 Gas Block Journal 1:5 Twist Rate 1/2x28 TPI Thread Pitch Weight: 12 oz M4 Feed Ramps View AllClose Additional Information Length: 5" Caliber: 5.56 View AllClose