Product DescriptionThe Armaspec Stealth Recoil Spring (SRS) GEN4 is a self-contained, multi-stage drop-in replacement for a standard buffer and spring. Designed to prevent the buffer spring from rubbing against the inner wall of the buffer tube, it helps deliver smoother, quieter cycling while the second stage helps reduce felt recoil. This model is intended for 9mm builds and is made in the U.S.A.Product Highlights Multi-stage, self-contained Stealth Recoil Spring (SRS) GEN4 drop-in buffer system replacement Helps reduce felt recoil for smoother shooting in 9mm AR platform setups Designed to keep the spring from rubbing inside the buffer tube for quieter operation Buffer mass designed to stay under constant tension against the bolt carrier Made in the USA; designed specifically for 9mm use (may require removal of the extra bolt carrier weight for proper function)Specs Brand Name: Armaspec Product Type: Stealth Recoil Spring (SRS) GEN4 (self-contained buffer & spring assembly) Caliber / Platform: 9mm AR platform (AR-9 / 9mm AR-15) Material: Steel Color: Stainless/Black Actual Weight: 9.5 oz Equivalent Buffer Weight: 6.4 oz (9mm) Country of Manufacture: USA Manufacturer Part Number: ARM253-9 UPC: 810048492800Disclaimer: 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.