Last night I was shooting my Brass Eagle Avanger and when I put the tank on I heard the gas leaking out. So I cocked it...it was a bit quieter but still could here it...so I just fired anyways....first few were okay...then all off the sudden, CO2 comes pooring out of the barrel and vertical feed port! I was like what the hell!?!? I kinda panicked...so I just unscrewed the gun and sat there for a few minutes wondering what the heck just happened. Some body tell me what happened and what I did wrong.