There’s a minor problem with the way the AR-15 rifle was designed, specifically the buffer assembly. Having a metal spring riding along the inside of a metal tube makes for quite a bit of noise when the action cycles and it can be annoying to the shooter. Armaspec thinks they have a solution in their Stealth Recoil Spring.
A drop-in replacement for the standard AR-15 spring and buffer assembly the Stealth Recoil Spring or SRS uses a central guide rod which allows them to move the spring away from the sides of the tube and isolate it in the center. But instead of having a single recoil spring, the SRS uses a two stage recoil spring system with a long light spring and a short heavy spring for easier cycling and better results.
Another cool feature is the rubber gasket in the front of the buffer. This gasket is the only point of contact between the buffer and the bolt carrier, isolating it further from the rest of the gun and providing constant pressure against the bolt carrier group to keep the bolt carrier from moving about.
The SRS comes in five different weights for both 5.56 and 9mm applications and retails for about $79, which is a bargain considering similar products cost somewhere north of $139.