Okay guys, I am trying to fix one of my son's friends Brass Eagle PB guns, Yeah I know he should just get a different gun but the poor kid can't afford it, and he ain't getting one of mine!. I have replaced all of his O rings and made some adjustments but the gun continuously acts as if it is running out of CO2. Meaning it does that rat a tat tat thing (sputtering or whatever, I am not quite sure how to explain but hopefully someone knows what I am talking about) constantly. It will fire afew good shots and then sputter, fire a few then sputter and so on. Any ideas???