just got a used AKA sidewinder reg and slapped it on my ion. I gassed it up and didn't zero out the reg (like an idiot) and the gun made a loud pop as soon as I turned gas on. the pressure shot up to 250 and would not fire. I turned the reg all the way down and now it wont go down below 200psi. anyone know a safe way to discharge the air, and the marker still wont cycle.