Well.. all TM AEGs (proper ones) have metal gears. But I don't know much about the V8 gearbox, so I can't give you any advice on upgrades. IMO, you should be fine with metal bushings (if it doesn't have those already) a stronger spring, and spring guide..
No reason the rails wouldn't go through. Its just a rail...
Welcome to ASC.
Cheers,
Alex
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