AR10 BCG (Bolt Carrier Group)R&B ARMS offers AR10 BCG (Bolt Carrier Group) in a Nickel Boron or Ion Bond finish. Select from a wide veriety of calibers including 308, 6.5 creedmoore and more All bolt Carriers are made from 8620 steel, While the Key is made from 4130 and is properly staked with and a 9310 steel bolt.
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