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If it's currently all stock parts, just upgrade the piston head for a polycarbonate one (not metal) with bearings, and a metal bearing spring guide. You shouldn't need new gears for an M120 spring. A metal hop up chamber would be good if only your current one has problem or you'll just be wasting money for no reason. You can get everything I've listed from airsoftparts.ca. Cheers
P.S. also regarding the piston, use it until it's stripped or worn out. You really don't need a full metal rack of teeths because you want the piston to wear out and not the gears.
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