At the bare minimum. All you really need is a ball bearing spring guide, PDI hopup unit, a new hopup rubber/bucking and tightbore barrel. Current production M24's are rated for 400 - 450 out of the box, but the stock barrel parts are less than ideal.
You could probably do just that to start out with, and save up for a PDI complete cylinder set, and you'd be good right after that. CA M24's are beasts durability wise. They won't come close to a VSRs accuracy but they sure as hell will outlive them.
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