Just get a shorter barrel.
A 590mm barrel and a 200mm barrel have the same range and accuracy. Going from 233 to 205 or whatever isn't going to hurt.
Don't worry about your fps so much. If the limit is 1.48j (400fps on a .20) and you're shooting 1.35j (380fps on a .20), then that's good enough.
You will not see any noticeable gains with an extra 20fps.
Built properly, your 380fps gun can still hit 300ft of range quite accurately.
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