Wilson Combat AR10 .308 WIN Low Mass Nickel Boron Bolt Carrier Group Nickel Boron. 308 Winchester ensures performance and reliability when you need it most. This lightweight low mass bolt carrier assembly has been precision machined from aerospace-grade 9310 tool steel providing superior toughness and durability. It's even gone through Magnetic Particle Inspection (MPI) to ensure optimal performance. For added strength and reliability the carrier is constructed from 8620 hardened steel with forward assist cuts while the gas key is properly staked using grade 8 fasteners so there are no worries about gas leakage or failure under pressure. To top it off this BCG features a corrosion-resistant nickel boron coating for increased lubricity and smoother cycling of your rifle.To experience optimal recoil control and lightning-fast follow-up shots Low Mass bolt carrier groups are the ideal choice for sporting or competition rifles. These lightweight carriers offer a quicker lock up time that is most beneficial when coupled with an adjustable gas block to refine pressure and timing of cycling. Polished nickel boron coating provides easy clean up and corrosion protection Low-Mass Carrier constructed of 8620 hardened steel Gas key staked using grade 8 fasteners to prevent gas leakage or failure under pressure Magnetic Particle Inspection (MPI) for optimal performance Machined ejector and extractor Perfect for .308/7.62X51 .243 6.5 Creedmoor .260 .338 and other .308 Winchester based calibers 15.5 oz. Specifications for Wilson Combat AR10 .308 WIN Low Mass Nickel Boron Bolt Carrier Group: Manufacturer: Wilson Combat Color: Nickel Features of Wilson Combat AR10 .308 WIN Low Mass Nickel Boron Bolt Carrier Group You can trust the nickel boron Wilson Combat Bolt Carrier Assembly for .308 Winchester crafted with meticulous attention to detail this low mass and light weight BCG will provide reliable performance when you need it most. Package Contents: Wilson Combat AR10 .308 WIN Low Mass Nickel Boron Bolt Carrier Group Wilson Combat TR-BCA-LM-NB-308: AR10 .308 WIN Low Mass Nickel Boron Bolt Carrier Group Nickel Boron