Product DescriptionThe Geissele Automatics Reliability Enhanced Bolt Carrier Group is engineered for shooters who demand durability, smooth function, and long-term reliability from their 5.56 rifle. This premium bolt carrier group includes the Geissele Stressproof Bolt, forged from Carpenter 158+ steel developed with Carpenter Steel metallurgists for a cleaner material with fewer impurities. The result is a stronger, more fatigue-resistant bolt designed to significantly outlast standard mil-spec components.Built with performance in mind, this 5.56mm bolt carrier group features a Nanoweapon coating for excellent corrosion resistance, wear resistance, and easier cleaning. Each forged bolt is rigorously inspected, high-pressure tested, and magnetic particle inspected to help ensure dependable operation. Supplementary manufacturer and distributor information also indicates a properly torqued and staked, chrome-lined gas key and extended upper rails to promote stable cycling and improved feeding reliability.Product Highlights Designed for 5.56 rifles with a reliability-enhanced bolt carrier group configuration Includes Geissele Stressproof Bolt made from Carpenter 158+ steel for added strength and fatigue resistance Nanoweapon coating helps resist corrosion, wear, and fouling while simplifying maintenance Each forged bolt is high-pressure tested and magnetic particle inspected for quality assurance Enhanced carrier design supports dependable cycling and improved feeding reliability Specs Brand: Geissele Automatics Manufacturer Part Number: 05-2993 UPC: 810081134996 Product Type: Bolt Carrier Group Caliber / Platform: 5.56mm Finish / Coating: Nanoweapon Bolt Material: Carpenter 158+ Stressproof Bolt Testing: High-pressure tested, magnetic particle inspected Gas Key: Properly torqued and staked, chrome-lined Compatibility: Designed for 5.56 rifles; supplementary web data indicates M16/M4 pattern compatibility Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product&';s manufacturer.