Product DescriptionThe Geissele Automatics Reliability Enhancement Kit H2 is a premium operating system upgrade for 5.56mm AR-15 pattern rifles. This kit combines the Geissele Reliability Enhanced Bolt Carrier Group with the Geissele Super 42 braided wire buffer spring and an H2 buffer weight to help improve cycling consistency, feeding reliability, and overall durability. The full-mass, full-auto-rated M16/M4 bolt carrier group features a properly torqued and staked, chrome-lined gas key, an H13 tool steel cam pin, and extended upper rails for added stability. Key components are finished with Geissele&';s Nanoweapon Chrome-Nitride coating for excellent corrosion resistance, wear resistance, and easier cleaning.Product Highlights Includes Geissele Reliability Enhanced Bolt Carrier Group, Super 42 braided wire buffer spring, and H2 buffer weight Designed for 5.56mm AR-15 platforms with a full-mass, full-auto-rated M16/M4 bolt carrier group Nanoweapon Chrome-Nitride coating helps resist corrosion, abrasion, wear, and carbon buildup Properly torqued and staked chrome-lined gas key supports dependable operation under demanding use Extended carrier rails and H13 tool steel cam pin enhance stability, longevity, and feeding reliability Specs Brand: Geissele Automatics Product Type: Reliability Enhancement Kit Model / Configuration: H2 Caliber Compatibility: 5.56mm / 5.56x45 NATO Platform Compatibility: AR-15 pattern rifles Bolt Carrier Group Type: Full-mass, full-auto-rated M16/M4 Included Components: Reliability Enhanced Bolt Carrier Group, Super 42 braided wire buffer spring, H2 buffer Gas Key: Properly torqued, staked, and chrome-lined Cam Pin Material: H13 tool steel Carrier Feature: Extended upper rails Coating: Geissele Nanoweapon (Chrome-Nitride) Manufactured In: North Wales, Pennsylvania UPC: 817953026724 MPN: 05-492-H2 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.