Armaspec SRS-9 Buffer Tube Kit Features The Armaspec SRS-9 Buffer Tube Kit bundles everything needed to install a collapsible stock on an AR-15 Gen4 lower including a mil-spec six position 7075-T6 buffer tube a steel castle nut and an end plate so builders do not need to source these parts separately. At the heart of the kit is the SRS Gen4 Armaspec s Stealth Recoil Spring system which is a self contained multi stage drop in replacement for a standard buffer and spring. This system is designed to keep the buffer spring from rubbing against the inner wall of the tube which is a common source of rattling and friction in standard AR-15 setups. The result is noticeably smoother quieter cycling through every shot. Beyond reducing noise the SRS Gen4 s second stage helps significantly reduce felt recoil giving the shooter faster follow up shots and a more controllable rifle under rapid fire. The kit s four components are finished in matte black to match standard AR-15 hardware keeping the look consistent with the rest of a typical build. Because the buffer tube is mil-spec sized it remains compatible with the wide range of collapsible stocks already on the market built to that same mil-spec standard. Builders upgrading an existing Gen4 lower or finishing a new build will find this kit a straightforward way to improve both the feel and the function of their rifle. Armaspec SRS-9 Buffer Tube Kit Specifications Manufacturer: Armaspec Model: SRS-9 Buffer Tube Kit Color: Black Finish: Matte Number of Pieces: 4 Compatible Hosts: AR-15 Gen4 Available At: GrabAGun