Daniel Defense Barrel, M4 Profile, 16 Length, 1:7 Twist, 1/2x28 Threads, Carbine Length Gas System, Mil-Spec Heavy Phosphate Finish, Black Color, Chrome Bore 07-075-08174-018 High quality components and precise manufacturing make Daniel Defense parts ideal for maintaining and upgrading firearms. The durability, reliability and excellent build quality of these parts will ensure years of service you can count on.