The Beavertail....
The Beaverail is normally a piece of metal that is bolted on to the back of the autococker, it was originally intended to prevent people from pressing down the cocking rod in order to increase the velocity of their paintball from shot to shot. It is a required item for a cocker to be tourny legal, and it also helps stop you putting your goggles too close to the moving back block on the cocker and thus protects you from smashing your goggles and looking like a muppet.
Zwitta