This FN manufactured 5.56x45mm AR-15 barrel is produced to the same specifications as US military issue barrels.
Starting from 4150 steel alloy, the barrel is button broached with a 1-7 right-hand twist per military specifications. This process ensures a consistent and uniform bore. The bore is then chrome lined and exterior finished with a mil-spec, black phosphate.
- Chambered in 5.56x45mm NATO
- Includes barrel extension with M4 feed ramps
- Length: 16”
- OD at the gas journal is .750
- Barrel weighs 1lb 8oz
Muzzle features 1/2-28 threads for attachment of a standard A2 flash hider, or the muzzle device of your choice. This particular barrel features a lightweight profile and a mid-length gas system.
Big Book Catalog, Issue:70, Page:019