Product Description The Strike Industries Viper Modular Fixed Stock (MFS) is designed to deliver the solid lockup and strength of a fixed stock while still offering the fit customization typically associated with collapsible stocks. It installs on a standard carbine-length receiver extension and uses the included shim set to adjust length of pull for a more personalized shooting position. Built from durable polymer in a Flat Dark Earth finish, this modular stock also includes integrated sling-friendly attachment options for practical rifle setups. Product Highlights Modular fixed stock design combines a rigid fit with adjustable length-of-pull tuning Customizable length of pull from 12" to 14.25" using the included shim set Uses a standard carbine-length receiver extension for AR-15 carbine builds Integrated Snap Hook attachment point and sling loop for versatile carry options Durable polymer construction in Flat Dark Earth to match popular rifle colorways Specs Brand: Strike Manufacturer Part Number: STRIKEFSFD UPC: 708747546903 Product Type: Buttstock (Modular Fixed Stock) Platform Compatibility: AR-15 (Carbine) Receiver Extension Compatibility: Standard carbine-length receiver extension; for mil-spec carbine or Strike Industries Advanced Receiver Extension 7-position buffer tubes only Length of Pull: 12" to 14.25" (via included shim set) Material: Polymer Color/Finish: Flat Dark Earth Buffer Tube Included: No 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.