The valves hold more residual pressure with the level 10 bolt than with the level 7 bolt and the level 7 would operate at a lower chamber pressure so that you shoot all excess air out of the chamber before pulling the valve. With the level 10 bolt, there is always a significant amount of air in the chamber, even after you degass and pull the trigger for that last shot. If you hold the trigger in while pulling the valve, the on-off pin will generally clear the hole in the body.
Except for the Automag in front, its usually the man behind the equipment that counts.