LANTAC USA Bolt Assembly 6mm ARC AR-15 Black Nitride

The LANTAC USA 6mm ARC Bolt Assembly is a precision-engineered replacement bolt purpose-built for AR-15 rifles chambered in 6mm ARC. Manufactured from MPI-inspected Carpenter 158 or 9310 steel, the bolt is hard-ground on all critical diameters, S110 shot peened, and heat treated to a final hardness of 15N 89-90.5 for the durability needed to handle the pressures generated by the 6mm ARC cartridge.

A low-friction Black Nitride finish provides improved wear resistance and easier cleaning compared to standard phosphate coatings. The bolt drops into any AR-15 bolt carrier group to complete or refresh a 6mm ARC build, and pairs naturally with LANTAC's Enhanced Bolt Carrier Group for the same cartridge. Made in the USA by LANTAC USA and sold as the bolt assembly only; carrier and related components are not included.