Faxon TiN AR-15 Complete Bolt Carrier Group If you want your AR-15 rifle to perform at the highest level then look no further than this Faxon TiN AR-15 Complete BCG. This BCG will meet your performance standards and value. This BCG has a 9310 tool steel bolt which is stronger and nitriding the assembly to increase surface hardness, decrease resistance, and have superior corrosion resistance. This BCG was fully MPI tested to ensure the material is sound and without defects. Bolt lugs are chamfered 45 degrees to ensure reliable action. The bolt carrier group was Superfinished to reduce friction, increase the smoothness of operation, and reduce fouling. It is full-auto rated and the gas key uses grade 8 fasteners and is fully staked.