The Armaspec Stealth Recoil Spring H2 Gen4 is a self-contained multi-stage drop-in replacement for your standard buffer and spring system designed for smooth quiet operation and significantly reduced felt recoil.Armaspec Stealth Recoil Spring SRS GEN4H2 buffer weight configurationMulti-stage design prevents spring rubbing against buffer tube wallsDrop-in replacement for standard buffer and springBuffer mass maintains constant tension against bolt carrierMade in the U.S.A.Perfect for shooters seeking improved comfort and performance this advanced recoil management system delivers smoother cycling and reduced felt recoil for enhanced shooting control and accuracy.