The Armaspec Stealth Recoil Spring (SRS) GEN4 is a self-contained multi-stage drop-in replacement for your standard buffer and spring system. Designed to provide smooth quiet operation while significantly reducing felt recoil.Armaspec Stealth Recoil Spring GEN4 KitIncludes C H and H2 buffer weightsDrop-in replacement for standard buffer and springMulti-stage design reduces felt recoilPrevents buffer spring from rubbing against inner buffer tube wallBuffer mass maintains constant tension against bolt carrierMade in the U.S.A.Perfect for AR-15 builds requiring enhanced performance reduced recoil and quieter cycling operation with multiple buffer weight options for optimal tuning.