The Sons of Liberty Gun Works OCKS BCG 5.56 Phosphate is engineered as the essential component for reliability in your AR-15 platform. This bolt carrier group is designed to work seamlessly with 5.56 NATO, .300 Blackout, 6MM MAX, and .350 Legend ammunition, ensuring optimal performance in various applications. The phosphate finish enhances durability and corrosion resistance, making it suitable for tactical and training environments. Key features include full-auto test fired bolt assembly and the innovative OCKS (Optimized Carrier Key Screws) upgrade, which improves the overall functionality and reliability of your firearm. Whether you are building a new rifle or upgrading an existing one, this BCG is a solid choice for dependable performance.