I purchased the gun new I had the trouble after about two weeks while the gun was stock never opened. I wanted to do some up grades to improve FPS so I thought I would change the spring, piston and piston head. I did also purchase some steel bushings but I did not change them because I still need shims. Anyway I changed the tappet plate when I did the mods because I read that this could be the solution. I would like to say that it seemed that the problem started right after I adjusted the hop up for the first time. That's why I thought it might be the hop up.
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