Ergo M4 Receiver Castle Nut, Black

This versatile component is engineered to seamlessly integrate with a wide range of AR platforms, including the AR-15 and all its variants. Designed for compatibility with commercial, military and hybrid buffer tubes, it ensures a perfect fit and reliable performance across diverse applications. Whether you're outfitting a tactical setup, upgrading a sporting rifle or enhancing a custom build, this component delivers the adaptability and precision you need. Built to meet rigorous standards, it offers durability and functionality for both professional and recreational use, making it an essential addition to any firearm enthusiast's toolkit.Mil-spec car castle nut compliant with standard specificationsConstructed from steel and finished with a black coating