CM032 120M/s UPgrade ?

[EnergyDrink]

Hello,
First, I'm a proud owner of a Cm032 M14,
I'm really happy with my gun but I want to upgrade it to 120 M\s instead of
stock 100.
witch parts of the gun I need to upgrade too so it won't brake ?
I spouse spring guide is a must, because it's plastic...
I think the gears and stock metal bushings should hold up,
but I'm not sure about the other parts,
if any one could shade some light on the subject,
I'll be most thankful.

[The Acer]

http://www.airsoftcanada.com/showthread.php?t=2697

im not sure about the quality of the gears and bushings, but with that spring, u should be ok, it should hold up