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Stick with your stock TM mechbox.
Swap the plastic bushings with Modify metal bushings (6mm) and reshim.
Swap the plastic spring guide with a Modify metal bearing spring guide
You'll probably hit somewhere in 310-330fps range there. Your rifle will perform really well and there'll be little wear and tear on it. You'll be safely under 350fps so there'll be no worries of chrony'ing too hot for a 350fps MAX limit game.
If you need to try and get a bit more, consider either swapping the stock spring to a Modify S90 and/or swapping in a 6.03mm tightbore. But you stand a good chance of breaking 350fps if you do both....or if you're lucky, you'll end up right in the mid 340's fps.
Best of luck,
Tys
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