The AR-15 Bolt Carrier Group - SBN Nitride Coated is a high-performance BCG built to MIL-SPEC standards, featuring a Super Black Nitride coating for enhanced corrosion resistance and heat protection. It undergoes HPT and MPI testing for reliable performance. Ideal for 5.56 NATO, this drop-in BCG offers durability, smooth cycling, and long-lasting reliability, making it perfect for replacements or new AR-15 builds.