Product Description

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 Mfg: Rubber City Armory 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 upp