G&G stock bearing-bushing (8mm)
 

Will G&G stock bearing-bushing (8mm) break using an m120...

I recently upgraded my spring to a Systema m120 spring.
Also bougth systema piston/piston head...
I was wondering if the 8mm ball bearings-bushing in my G&G GR-16 would be able to hold the m120 spring without breaking?

I've searched the forums but everyone seems to have a different opinion so im asking again :P

It really depends on your gear choice and motor choice. Bushings/bearings hardly break once it gets pass the 6mm point. anyway, i would recommend a PDI 170% over the m120, but since you've already got it, i would recommend gears with a torqued rating. Is your piston half or full teeth? If it's half, get some 1st rating gears that is hellical. (Prometheus 1st torque rating is actually called "double torque" whereas it's standard ratio is called "torque-up") If it's full teeth, I think you'll be obligated to get some more expensive gears.