In the real world, unless a cocker is badly timed, or the paint being shot is crap, then a cocker shouldnt chop.
However, i was one of the first to see the ones sparklie has, and the seem pretty simple in principle.
the bolt pin is spring loaded. So that if the paintball hasnt properly fed, and the back block comes forward, then the bolt will be able to stop against the ball.
i am yet to see one in action. but with all these new electro frames for the cocker hitting the market. then some people may find them a vital investment.
Reporting from the streets of Bagdad, Billy