F-1 Firearms DuraBolt Gold direct impingement full auto rated AR10 bolt carrier group is compatible with DPMS spec large frame receiver sets and associated components. The DuraBolt Gold is enhanced with a Physical Vapor Deposition (PVD) TiN coating, which gives it an extremely durable and corrosion resistant gold mirror finish. The Durabolt Gold’s coating also offers excellent lubricity with a 0.45 coefficient of friction.

Carpenter 158 bolt, ground after heat treat, MPI and HPT
9310 steel carrier, ground after heat treat
Weight-1.12lbs