KAK Industry Bolt Carrier Group designed for .224 Valkyrie and 6.8 SPC chambers. Features a chrome-lined interior with a phosphate finish for durability and corrosion resistance. M16 auto profile carrier machined from 8620 steel, properly heat-treated, precision ground, and finished with a chrome-lined phosphate coating for durability and corrosion resistance. Built to deliver reliable performance at a competitive price.