Product DescriptionThe Bravo Company BCM MK2 Receiver Extension is a Mil-Spec receiver extension (buffer tube) designed for AR-15 platform rifles including AR15, M16, and M4. It is machined from durable 7075-T6 aluminum and built to Mil-Spec dimensions, providing a proper Mil-Spec diameter interface for compatible stocks. This 8-position receiver extension is designed to help optimize the recoil system, but it requires a proprietary setup: use a rifle action spring and the specific BCM MK2 buffer (standard carbine and rifle buffers will not work).Product Highlights Machined from 7075-T6 aluminum for a strong, lightweight Mil-Spec receiver extension Mil-Spec dimensions/diameter for compatibility with Mil-Spec sized AR stocks 8-position adjustment for flexible length-of-pull setup Designed to help reduce felt recoil when used as part of the BCM MK2 system Requires rifle action spring and proprietary BCM MK2 buffer (carbine/rifle buffers will not work)Specs Brand: Bravo Company Product: MK2 Receiver Extension (Buffer Tube) Platform Compatibility: AR-15 / M16 / M4 Adjustments: 8-position Material: 7075-T6 aluminum Specification: Mil-Spec dimensions Finish/Color: Type III hard coat anodized, black Required Components: Rifle action spring and specific BCM MK2 buffer (standard carbine and rifle buffers are not compatible) MPN: BCM-MK2-RE UPC: 812526023599Disclaimer: 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.