The KAK Industry AR-15 Carrier Completion Kit provides quality American-made components with chrome plated firing pin 4140 steel cam pin and phosphate coated retaining pin for reliable performance.KAK Industry AR-15 Carrier Completion KitChrome plated firing pin for corrosion resistance4140 steel cam pin for durabilityPhosphate coated retaining pinCompatible with all AR15/M16 style carriersAmerican-made quality componentsPerfect for AR-15 builds and maintenance offering affordable sustainable pricing without compromising on quality or performance for your bolt carrier group.