Here we see the many different versions and methods of how to prevent double feeding in an autococker. Many times people become confused when they lean their autococker forward and the ball rolls out of the barrel. First thing they do is replace the ball stopping device. And this is simply not the case. Autocockers use a closed bolt operation. And then the bolt is closed or in the forward position, the ball is already past the ball stopping device. In preventing this "barrel roll-out" a good multi-bore barrel system is a great asset. Inconsistancy with FPS on the chronograph can also be accredited to particial ball roll-out.