Armaspec SRS-BB Buffer Tube Kit Gen 4 AR-15 7075-T6 Black

The Armaspec SRS-BB is a complete AR-15 buffer tube kit built around Armaspec's fourth-generation Stealth Recoil Spring (SRS) system - an enhanced, multi-stage recoil buffer designed to smooth the action cycle and reduce felt recoil. This kit bundles every component you need to mount a stock assembly on a mil-spec AR-15 lower receiver.

The kit's foundation is a mil-spec 7075-T6 aluminum 6-position buffer tube, offering the same carbine-length footprint and stock adjustment range as a standard carbine stock mount. A steel castle nut and steel end plate round out the mounting hardware, giving you everything required to lock the tube securely to the lower.

At the heart of the kit is the SRS Gen 4 - a multi-stage spring and buffer system that manages bolt travel more progressively than a standard spring and buffer weight, producing a smoother recoil impulse and a noticeably quieter action. It is a direct drop-in replacement for a standard AR-15 carbine buffer and spring. The tube carries a matte black finish that pairs cleanly with most factory and aftermarket lowers.

Whether you're building a new carbine, replacing worn components, or upgrading from a standard buffer and spring, the Armaspec SRS-BB kit delivers a matched, complete set - tube, multi-stage recoil system, castle nut, and end plate - all in one package.