R&B ARMS 5.56 Nickel Boron Bolt Carrier Group is a great choice for any AR-15 build. This drop-in AR-15 BCG features a slick, corrosion resistant nickel boron finish, MIL-SPEC dimensions, and a C158 bolt. The carrier is made from 8620 steel, While the Key is made from 4130 and is properly staked. Nickel Boron offers lubricity, Wear Resistant, Smoother recoil, Improved Consistency, Faster Cyclic Rate, Easier Cleaning, and Reduced Carbon Fouling. Proudly made in the U.S.A. veteran owned and operated business.Nickel Boron is the top of the line coating. It is engineered to minimize friction by cutting down the surface to surface contact between sliding parts. Nickel Boron not only reduces friction, but also dissipates heat, allowing for least wear and tear.
We will ensure satisfaction with every AR 556 BGC and make sure its the right fit for your rifle.