The Stealth Recoil Spring is designed to reduce felt recoil while preventing noisy metal-on-metal contact inside the buffer tube. Engineered as a single-stage drop-in replacement for your AR-15's standard buffer and spring, the SRS features a dual-spring design for more consistent spring weight-meaning a higher level or reliability and recoil control for you. If you want a smoother, softer-shooting AR-15, look no further. PLEASE NOTE: The SRS comes with Red LOCTITE on the front metal stop and Blue LOCTITE for the bottom bumper. When reassembling, Armaspec recommends reapplying LOCTITE. The SRS can be installed with or without a buffer retainer. Keeps the buffer spring from rubbing against the inner wall of the buffer tube Single-stage drop-in replacement for your standard buffer and spring Dual-spring design for more consistent spring weight Buffer mass is designed to stay under constant tension against the bolt carrier Rubber O-ring on the head of the buffer mass prevents metal on metal contact Reduces felt recoil Made in USA Order today!