bolt sizes i think

[johnny dee]

i was wondering if you have to use the superbolt in the lvl 10 or can you put a venturi bolt in there instead if thats what you want in it

[Rambozo]

You have to use the superbolt in the kit.

[FrAuStY]

Check out the post Titled "All LVL 10 Info" in the paintball talk forum,this shows a cut-away and reasoning on why you can't use another bolt with the LVL10. It's the bolt that makes the upgrade work.