Yeah, the backspin on the Galactic Z bodies was created by the ball traveling under a rubber bumper that caused the top of the ball to rub on it. The body was best used with large bore barrels so that friction was minimized allowing the ball spin to continue down the length of the barrel as it accelerated. The downside of the galactic body was that it couldn't be used with brittle paint because it could easily break on the bumper.
Except for the Automag in front, its usually the man behind the equipment that counts.