Well, it'd be the same principle as upgrading an AEG, except you might not find all the parts you need and all the parts you have are more fragile.
If the cylinder is vented, an unvented cylinder should up the fps but at the cost of ROF. A more powerful spring will raise the fps significantly, but the question is what springs for AEP exist and how much punishment can an AEP's mechbox take. A tight bore inner barrel that's longer than stock should help a little, although you'll probably need a silencer to hide it in. Personally I'd aim for 270-280s and be fairly happy with that, as that's stock Tokyo Marui fps on many of their largest rifles.
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