Introducing Brownell’s M4 Carbine stripped carbine length barrel, perfect for your M4 or M4A1 replica build. Chambered in 5.56x45, the chrome lined barrel has a 1-7 twist, and is finished in black phosphate with an overall length of 16”. The barrel features an M4 barrel extension and has ½-28 threads. No other hardware is included.
Big Book Catalog, Issue:72, Page:012