Hi, i have a 4* mini-mag and when I air up the gun and pull the trigger it leaks through the barrel alot like a stream of nitrogen. I sent it to a paintball shop in VA and they fixed it, till i fired it about 100 shots with paint. They said that he had to take off the frame and clean up the paint around the gun (has a custom paint job). I have all the power tube spacers and tried all of them. Like I said it worked great untill the 100 or so balls, and I turned up the velocity and it did the same thing. WHAT IS IT, sounds like a o-ring? But I am a newbie and dont know anything about this gun, it was bought used. Thanks please help if you can! Cause im

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