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Stock ICS guns tend to sit around 330fps anyways. As above, all you need is to change springs and other fps varying parts. You could literally get what you want by paying $50 as opposed to paying $250 and getting the same result.
Other question is: Why do you want to upgrade your gun? I understand the usual reasons, but I've learned to use my 300fps TM MP5 shooting 0.28g BBs outdoors and have no real problems with it. And my other MP5 I downgraded from 400fps to 360fps just because it works better at that velocity with better range.
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