This kit is a Hybrid design utilizing our Enhanced Buffer Tube Cover kits and the Mission First Tactical EVOLV Battle Stock Attachment. The MFT EVOLV, and Buffer Tube Cover, are now pre-assembled in house, and mounted directly to the buffer tube using a specially designed steel bracket and adapter kit. The result is a rock solid, ergonomic cheek weld that provides stability for accurate, repeatable shooting, and a proper sight line for your favorite optics or sights. COMPATIBILITY: Mounts directly to any pistol, or pistol adapter, that accepts an AR-15 buffer tube/receiver extension. (1 3/16" threads) Some Receiver End plates with QD or loop sling attachment points on the Mfg: Thordsen Customs Llc