Product DescriptionThe CMMG Helical Gas Ring (Mk4) is a replacement helical-style gas ring designed for AR-15 platforms. Built to restore proper function and reliability, this component is intended for use when servicing or replacing worn gas rings on an AR-15 bolt/bolt carrier group assembly.Product Highlights Replacement helical gas ring for AR-15 applications Helical-style design intended to maintain consistent gas seal performance Ideal for maintenance, repair, and parts replacement on AR-15 bolt assemblies Genuine CMMG part for dependable fit and function California Proposition 65: see www.P65Warnings.ca.gov for warning informationSpecs Brand: CMMG Product Type: Helical gas ring (replacement part) Platform Compatibility: AR-15 Model: Mk4 Manufacturer Part Number: CMM55BA48A UPC: 810046231401Disclaimer: 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.