Product DescriptionThe CMMG A1 Receiver Extension is a rifle-length buffer tube built for AR-platform rifles that use fixed rifle-length stocks. Finished in black hard coat anodized aluminum, this receiver extension is designed for AR-15/M4/M16 and LR-308 pattern builds and is compatible with CMMG Mk4 (AR-15) and Mk3 (LR-308) lower receivers.Product HighlightsRifle-length A1 receiver extension (buffer tube) for AR-platform riflesBlack hard coat anodized aluminum construction for durability and corrosion resistanceDesigned to accept fixed rifle-length stocksCompatible with AR-15/M4/M16 and LR-308 pattern setupsWorks with CMMG Mk4 (AR-15) and Mk3 (LR-308) lower receiversSpecsBrand: CMMGManufacturer Part Number: CMM55CA9B7UPC: 815835017334Product Type: A1 receiver extension / buffer tubeLength: Rifle lengthColor: BlackMaterial/Finish: Hard coat anodized aluminumStock Compatibility: Fixed rifle-length stocksPlatform Compatibility: AR-15/M4/M16/LR-308 patternReceiver Compatibility: CMMG Mk4 (AR-15) and Mk3 (LR-308) lower receiversDisclaimer: 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.