The simplest upgrade you can get is the spring and bushings one. Don't put too stiff of a spring (I'd say max 350 fps) in there with only upgraded bushings, cause things will start to break. If you want to upgrade further, you'll be changing basically the whole gearbox. Don't quote me on that last part as I've never done this kind of upgrade, so I don't know exacly which parts you can get away with stock. I've always felt a spring bushing upgrade to 330 fps was more than enough.
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