i ordered almost the same barrel 5 weeks ago from Craddock Precision, .223 Wylde Bartlein Barrel Twist: 7T, 400MODBB: No, Gas Block Diameter: .750" / Lightweight, Barrel Length: 18" Mk12 Mod 0 (Rifle Gas, .750" Gas Block Dia), Thread Size: 1/2x28, Thread Protector: No, Fluting: None...