My wife loves playing paintball and so do I my question is my wife's gun has messed up the o-ring busted and I replaced it, but air still leaks out.I checked everything twice to see if their was anything else but I can't find anything.does anyone have any clue what's going on.

You may have used the wrong o-ring. There's another o-ring for paint guns that is very close to the same size as the one for co2 tanks, but not exact. Double check to be sure you have the right ones for the tank. If so, try another: I find that 1-2 per dozen are just faulty.

You may also check all the o-rings in the gun as well as the ones on the tank, and if possible try another tank to be sure.

Just curious, what type of gun is it?