Engineered for precision and reliability the Spikes Tactical Steel Black Phosphate AR15 M16 Bolt Carrier Group stands out with its robust steel construction and sleek black phosphate finish. Designed to meet mil-spec standards this BCG features a full auto M16 bolt carrier and a laser-engraved ST spider logo setting it apart in both functionality and style. It includes a mil-spec extractor gas key firing pin cam pin and retaining pin ensuring seamless performance for your 223 Remington/5.56 NATO rifles. Weighing in at 11.60 oz this bolt carrier group is a testament to durability and quality craftsmanship perfect for enthusiasts seeking a high-performance upgrade.