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How can I reduce FPS on my AEG?

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I recently purchased an M4 style AEG and it's shooting around 390 fps. I am playing in Japan and the legal limit is 300 fps or lower. Someone told me that you can replace the spring inside the gearbox to make it less powerful, but are there any other options to make the gun shoot much less? If I do change the spring, does anyone recommend a spring or something else to buy to replace the current one?


Any feedback is very much welcome. The gun MUST shoot 300 or lower FPS. 

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You can try short stroking the piston. It is rather difficult and involves grinding (or filling) some teeth off the piston. From my experience, removing one tooth drops your FPS by about 15.

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