That fps in Canada is really rare (most fields are limited to 400fps for AEG's) but there are a few people here that should be able to help you. Your rate of fire will drop quite a bit with a velocity that high though, may want to get torque up gears to be able to push the spring but that will reduce your ROF even more. The STAR M249 mechbox is polycarbonate which is stronger than TM potmetal but I don't know how much stronger.
CA mechboxes are a very similar design but metal and are the strongest AEG mechboxes I know of. You can get metal replacement mechbox shells for STAR guns which may be require, may not, don't know.
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