Shop › DD BBL ASSY 5.56 1-7 16" M4 CAR DD BBL ASSY 5.56 1-7 16" M4 CAR $327.00 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 Quantity: Add To Cart Added! 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