Product DescriptionThe Geissele Automatics Reliability Enhancement Kit H3 is a premium upgrade package for AR-15 pattern rifles chambered in 5.56mm NATO. Built around Geissele&';s Reliability Enhanced Bolt Carrier Group, this kit combines a full-mass, full-auto-rated M16/M4 bolt carrier group with the Geissele Super 42 braided wire buffer spring and an H3 buffer weight for improved cycling, stability, and feeding reliability. The carrier features a properly torqued and staked, chrome-lined gas key, extended upper rails for increased operational stability, and a durable Nanoweapon chrome-nitride coating for outstanding wear and corrosion resistance. The cam pin is machined from advanced H13 tool steel, while the bolt is made from Carpenter 158+ steel for enhanced strength and consistency.Product Highlights Complete Geissele Reliability Enhancement Kit with Reliability Enhanced Bolt Carrier Group, Super 42 braided wire buffer spring, and H3 buffer Full-mass, full-auto-rated M16/M4 bolt carrier group engineered for AR-15 5.56mm NATO platforms Nanoweapon chrome-nitride coating helps resist corrosion, wear, abrasion, and carbon fouling for easier maintenance Extended carrier rails and properly staked chrome-lined gas key support greater stability and dependable feeding Premium internal components include an H13 tool steel cam pin and Carpenter 158+ steel bolt for long-term durability Specs Brand: Geissele Automatics Manufacturer Part Number: 05-492-H3 UPC: 817953022696 Product Type: Reliability Enhancement Kit Platform Compatibility: AR-15 pattern rifles Caliber / Cartridge: 5.56mm NATO / 5.56x45 NATO Carrier Type: M16 Included Bolt Carrier Group: Geissele Reliability Enhanced Bolt Carrier Group Included Spring: Geissele Super 42 Braided Wire Buffer Spring Buffer Weight: H3 Gas Key: Properly torqued, staked, and chrome-lined Cam Pin Material: H13 tool steel Bolt Material: Carpenter 158+ steel Carrier Material: Mil-Spec 8620 steel Coating / Finish: Nanoweapon chrome-nitride coating, matte black finish Weight: 1.2 lb Length: 11.3 in Width: 1.0 in Height: 1.0 in 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.