The KAK AR15 Bolt Carrier Group features advanced NP3 coating applied through an electroless nickel plating process combined with fluoropolymer for superior performance. This coating provides reduced friction enhanced corrosion resistance and improved fouling resistance for reliable operation.KAK AR15 Bolt Carrier Group - M16 Auto Profile Carrier9310 bolt steel for enhanced durabilityNP3 coated cam pin for smooth operation4130 steel gas key construction5.56/.223 caliber compatibilityLow friction NP3 coating reduces wear and maintenanceEngineered for AR15 platforms this BCG delivers exceptional reliability and longevity with its premium materials and advanced coating technology making it ideal for both recreational and professional applications.