I got an Rt marker. After alot of problems finally got it shooting. I just added the shims in to try to help and now it actually fires more then once. Now the problem is that it shoots about 10 or 12 shots then the trigger 1/2 depresses and starts leaking air. I searched around from any damaged or missing o rings and can't seem to find anything wrong. Can someone point me in the direction of getting this gun going again

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