The Armaspec enhanced buffer tube kit provides everything you need to securely mount a stock assembly onto a lower receiver. This kit includes a Mil-Spec 7075-T6 6-position buffer tube, a steel castle nut and an end plate. It also features the innovative SRS GEN4 Stealth Recoil Spring, an enhanced multi-stage recoil buffer system. The Stealth Recoil Spring SRS GEN4 is a self-contained drop-in replacement for traditional buffers and springs. Designed to prevent the buffer spring from rubbing against the inner walls of the buffer tube, it ensures smooth and quiet operation. The multi-stage design significantly reduces felt recoil, enhancing control and comfort during shooting.