The WMD Bolt Assembly 450 Bushmaster is engineered for optimal performance, featuring a durable NiB-X nickel boron coating that enhances longevity and simplifies cleaning. This bolt assembly is designed to deliver superior locking and unlocking action with barrel extensions, making it a reliable choice for your firearm. Constructed from case-hardened 9310 steel and featuring a high-performance extractor, ejector springs, and gas rings, this assembly is magnetic particle inspected for quality assurance. The special O-ring buffer further enhances functionality, ensuring seamless operation in your AR platform. Intended Use: Ideal for building or upgrading AR-style rifles. Key Benefits: Enhances firearm reliability and ease of maintenance. Key Features: - NiB-X Nickel Boron Coating for long life - Case Hardened 9310 Construction - High Performance Extractor and Ejector Springs - Special O-Ring Buffer for improved function Summary: Upgrade your AR build with the WMD Bolt Assembly 450 Bushmaster, designed for high performance and dependable operation, making it an essential component for serious shooters.