The SRS Gen 4 stealth recoil spring introduces an all-in-one, multi-stage system that effortlessly takes the place of your typical buffer and spring setup. Its ingenious design averts any friction between the buffer spring and the inner wall of the buffer tube, guaranteeing seamless and hushed operation. Working in perfect sync, the dual stages synergize to substantially diminish perceived recoil. To bolster longevity and eliminate potential points of failure, we've made several key improvements: the plastic end piece is now secured with a roll pin in lieu of a screw, the rod features a machined cap for greater robustness, and the traditional snap ring has been exchanged for a washer.