Surface Coating Reduces Friction, Requires Minimal Lubrication
Drop-in-ready bolt-and-carrier group has a proprietary low-friction coating that minimizes the need for lubricants that can attract and hold grit, bind, or thicken up. BlacknitridePlusSM processing gives the metal a harder, stronger surface than the substrate underneath, providing extreme durability, reliability, and resistance to wear and corrosion, in addition to extending the life of critical parts. Also helps dissipate heat efficiently, so operating parts run cleaner and cooler. Less carbon buildup makes field cleaning easier - fouling wipes away with a clean cloth. Endurance tested for thousands of rounds and magnetic particle inspected to ensure no hidden defects. Complete and fully assembled with bolt (extractor, ejector, and gas rings installed), bolt carrier with staked gas key, cam pin, firing pin, and firing pin retaining pin. M16-style carrier has serrations for forward assist and full-length shroud to operate the auto-sear on full-auto/burst rifles.
AR-15, Issue:09, Page:100
Big Book Catalog, Issue:67, Page:013
SPECS: Bolt – Carpenter 158 steel, BlacknitridePlus coated, matte black. Carrier – 8620 steel, BlacknitridePlus coated, matte black. Firing pin – 17-4 stainless steel, hard-chromed, silver color. Gas key and cam pin also have BlacknitridePlus coating. Fits mil-spec AR-15/M16 upper receiver chambered in .223 Rem/5.56x45mm NATO.