Upgrade your AR 10 with the Bootleg Phos Bolt Completion Kit .308, engineered for superior performance and reliability. This kit includes a firing pin retaining pin made from 1038 steel wire, ensuring exceptional strength and resilience. The bolt, crafted from durable 9310 steel and coated in phosphorus, offers excellent corrosion resistance. The cam pin, forged from 4340 steel, is recognized for its outstanding toughness and wear resistance. Finally, the firing pin is made from 4140 steel, guaranteeing dependable ignition with every shot. Invest in quality and enhance your firearm’s performance with this essential bolt carrier group upgrade.