The Zero Kick Back Block is designed to work on any Autococker. Its made to replace the heavy stock aluminum one that comes stock on every Autococker, and its purpose is to reduce the kick/recoil during each shot. The decreased kick means your gun will remain much more steady while shooting. This makes long balling people even easier.This upgrade makes a noticeable difference on any Autococker.We also plan on making a lightened bolt, so keep your eye out. I haven't totally forgotten my fellow Autococker owners.