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Well, the CA mechbox shell is reinforced and is as good as any Systema or Guarder IMO. Stock, CA internals should last a long time without issues. With an upgraded spring, you're likely to see issues with your piston and spring guide, and the CA piston head leaves something to be desired.
I'd say keep the shell, throw in a Systema silent piston & cylinder head set, a Modify piston, Modify tappet plate and a metal bearing spring guide. Add a stiffer spring to get the velocity you want, and throw in an über-motor like a Systema Magnum motor, and you should hit that goal pretty easily and have a reliable mechbox.
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