Build or upgrade your AR-15 with the reliable ATI Commercial Buffer Tube Assembly. Featuring a 6-position, 7.8-inch buffer tube machined from 6061-T6 aluminum and finished with a resilient hard-coat anodizing, this assembly is built for long-lasting field use. Designed with a slanted back and commercial thread/tube diameter (1.168), the package includes everything you need for a complete installation: the buffer tube, AR-15 recoil plug, buffer spring, steel castle nut, and locking ring.