Product DescriptionThe Geissele Automatics Reliability Enhancement Kit H1 is built to improve the durability, consistency, and feeding reliability of a 5.56mm AR-platform rifle. This kit combines Geissele&';s Reliability Enhanced Bolt Carrier Group with a Super 42 braided wire buffer spring and an H1 buffer weight, creating a premium upgrade package for shooters who want dependable operation under demanding conditions. The full-mass, full-auto-rated M16/M4 bolt carrier group features a properly torqued and staked, chrome-lined gas key, extended upper rails for added stability, and a cam pin machined from advanced H13 tool steel.Geissele&';s Nanoweapon chrome-nitride coating adds exceptional resistance to corrosion, wear, and abrasion while also helping reduce carbon buildup for easier maintenance. The enhanced bolt carrier group is engineered for long-term performance, smoother cycling, and improved reliability, making this kit an excellent choice for hard-use rifles, training carbines, and performance-focused AR builds.Product Highlights Complete reliability upgrade kit featuring an enhanced bolt carrier group, Super 42 braided wire buffer spring, and H1 buffer weight 5.56mm full-mass, full-auto-rated M16/M4 bolt carrier group designed for dependable cycling and feeding performance Nanoweapon chrome-nitride coating helps resist corrosion, wear, abrasion, and carbon fouling for easier cleaning Properly torqued and staked chrome-lined gas key supports durability and consistent operation in demanding use Precision-machined H13 tool steel cam pin and extended carrier rails enhance stability and long-term reliability Specs Brand: Geissele Automatics Manufacturer Part Number: 05-492-H1 UPC: 817953027028 Product Type: Reliability enhancement kit Platform Compatibility: M16/M4 and AR-style rifles Caliber Compatibility: 5.56mm Bolt Carrier Group: Full-mass, full-auto-rated Included Spring: Geissele Super 42 braided wire buffer spring Included Buffer: H1 buffer weight Gas Key: Properly torqued, staked, and chrome-lined Cam Pin Material: H13 tool steel Carrier Rail Design: Extended upper rails Coating: Geissele Nanoweapon (chrome-nitride) Manufacturing Location: North Wales, Pennsylvania 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.