hi, i have a 90/4500 x stream and whenever i get the tank filled and put it on my gun (details in sig) it vents air out the back like its overpersurized.. i shoot it a few times and hold the trigger back and then its fine... this just seems to happen after i get it filled and only the first time i gas up the gun.... i was thinking the reg on the tank needs to be cleaned or something... anyone with experence with these tanks and regs wanna help me out.. i dont know hoy to take the reg off the tank either (yes i know to drain it first) and ND's webpage has nothing for maintinace for this either.. but any help would be greatly appreciated..

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