The KAK Industry bolt carrier group 7.62x39mm, black, is engineered for optimal performance in AR-15 platforms chambered for the 7.62x39mm cartridge. This bolt carrier group (BCG) is constructed from high-grade steel, ensuring durability and reliability under rigorous conditions. The black finish provides enhanced corrosion resistance and a sleek aesthetic. Precision-machined components ensure seamless cycling and consistent operation. The BCG includes a properly staked gas key, enhancing gas system reliability and reducing the risk of gas leakage. This component is compatible with standard AR-15 upper receivers, making it an ideal choice for custom builds or upgrades. The firing pin is manufactured according to military specifications from 8740 steel, precision ground and chrome-plated One-piece billet, fully machined, enhanced extractor with phosphate coating for improved reliability and corrosion resistance Phosphate cam pin Ejector and extractor retaining pin made from S7 tool steel 4130 gas key, chrome-lined and phosphate-coated, precisely staked using our hydraulic staking machine, chrome-lined phosphate KAK carrier key screws feature a T25 drive, are grade 8 and have undergone proper heat treatment The M16 auto profile carrier is precision machined from aircraft-grade, bearing-quality 8620 steel It undergoes proper heat treatment and is ground to exact specifications The carrier features a chrome-lined interior and a phosphate finish for enhanced durability The bolt is manufactured from a single-piece of aircraft-grade, bearing-quality 9310 steel It undergoes proper heat treatment, precision grinding, shot peening and magnetic particle inspection (MPI) and is finished with a phosphate coating