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Well it could be a few things, but lets start with a handful and you can see whether or not one is the answer. First when you set up your mechbox do you time the gears? If you are unsure what I am talking about then its a good chance its your problem, and if you need to know how to do it check out mechbox.com and see the video instruction on their site to make sure you have set up correctly. Second I didn't notice you mention but if you have modified the spring of the gun and you have the stock battery might not be up to the task. To check that install the stock G&G spring and try out a fresh battery to test. Also when you resemble your gear box its sometimes a good idea to place it back together without the cylinder installed and put your finger inside to move the gears. This way you can check to see that they are moving smoothly, and whether or not you need to maybe a few shims. Also make sure you are not missing anything, such as the small spring that connects the shell to the tappet plate.
My best guess though would be try to check the timing of your gears. I hope that helps, and please post your results I would like to know what is stopping it from running well.
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