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looks like an ebay company. ACPball.
basicly its an oring delrin bolt with the lower 30% removed. The entire air chamber after the inlet hole (and sealing oring) is completly removed.
I guess the idea is to encourage more air flow lower on the ball. (produce small amount of backspin)
I had a backspin bolt for an impulse (can't recall the name of it now). the idea was not to creat a longer or flatter shot but to encourage a controlled consistent spin on the ball as it left the barrel every time. The goal being tighter groupings at yardage.
good luck with it, and do some scientific testing and let us see some pics of 90 foot shots with your stock bolt and the new bolt.
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