A Knights Armament free-floating forearm rail maintains accuracy and provides plenty of surface area to mount accessories. The bolt carrier group meets full auto specifications and the precision lower receiver is full auto pictogram marked (safety configuration does not allow for full auto use) The Carpenter 158 steel bolt is shot peened and the properly staked gas-key is heat treated for durability. The barrel has a 1:7" twist 5R. The entire barrel, including bore and chamber, has a nitride finish to resist corrosion and provide hardness for longevity, far outliving chrome-lined barrels without impeding accuracy.
Please Note: This description may represent a general group of products. Please read the item's title and specifications for more specific information about this particular item.