Product Description The Strike Industries Viper Modular Fixed Stock combines the solid fit and strength of a fixed stock with the versatility of adjustable length of pull. Designed to use a standard carbine-length receiver extension, it adjusts via the included shim set to dial in a comfortable, consistent shooting position. Built from durable polymer and finished in black, the Viper MFS also incorporates a snap hook attachment point and sling loop for practical carry options on AR-15 platform builds. Product Highlights Modular fixed AR-15 stock delivers a rigid, ergonomic fit with collapsible-like adjustability Customizable length of pull from 12" to 14.25" using the included shim set Compatible with standard carbine-length receiver extensions for AR-15 platforms Integrated snap hook attachment point and sling loop for sling versatility Lightweight, durable polymer construction in a black finish Specs Product Type: Modular fixed stock Series: Viper Platform Compatibility: AR-15; fits AR-15 carbine receiver extensions Receiver Extension Compatibility: Mil-spec carbine or Strike Industries Advanced Receiver Extension 7-position buffer tubes only Length of Pull: 12" to 14.25" (shim-adjustable) Material: Polymer Color/Finish: Black Included: Shim set Buffer Tube Included: No Weight: 12.8 oz UPC: 708747546897 Manufacturer Part Number: VIPERMFSBK Brand: Strike 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.