The LBE Unlimited Nickel Boron M-16 Full Auto Bolt Carrier Group is a Mil-Spec quality bolt carrier group coated with Nickel Boron which makes the bolt run cooler and makes cleaning easier. The Carrier assembly is made from 8620 Steel. The bolt is made from Carpenter 158 Steel. The interior of the carrier is chrome Lined as well as the carrier key which is attached with grade 8 screws and staked.
Made in The USA