Stock bolt - sucks
Supa fly - faster but to much $$$$
Upgraded 03 prostock
None that i can find
I have an tricked out 03 vert feed with this bolt on it, before i got this bolt i could hear the stock bolt scratching the inside out my gun up even when i oil the crap out of it. then one of my friends let me use his cocker with the venturi bolt and it rock so i had to get one, the day i put it on my cocker i was tearing up the field all the people iu was playing with had tippmann 98's and a5's i was shooting them like crazy, they didnt stand a chance.
Buy this bolt if you want to upgrade your cocker, it is far better than the stock bolt