Product DescriptionThe Maxim Defense Industries JP Silent Captured Spring System (Standard) is manufactured exclusively for use with the Maxim Defense CQB Stock System, helping deliver smoother, quieter cycling than traditional buffer and spring setups. This unit requires a bolt carrier group (BCG) with an open channel to allow the guide rod to pass during operation; compatible modified BCG options are available from JP Enterprises. Built from durable tungsten and stainless steel components, this system is designed specifically for Maxim Defense CQB stock applications.Product Highlights Exclusive-fit JP Silent Captured Spring System designed for the Maxim Defense CQB Stock System Standard configuration for CQB stock setups Requires a bolt carrier group with an open channel for guide-rod clearance Constructed with tungsten and stainless steel materials for durability and performance Made in the USASpecs Brand: Maxim Defense Industries Product Type: JP Silent Captured Spring System (buffer/spring assembly) Compatibility: Maxim Defense CQB Stock System only Configuration: Standard Material: Tungsten and Stainless Steel Color: Grey/Black Country of Origin: USA Condition: New UPC: 680017475703 Manufacturer Part Number: MXM-47570Disclaimer: 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.