I have seen that happen a lot with G&G gears. But an M120 ain't a very heavy spring so it shouldn't break easily if shimmed correctly and AOE. I still believe that the stock gears should be fine with an M120 but if OP is concern, upgrade.
Quote:
Originally Posted by THe_Silencer
The strength of G&G gears are some of the worst I've seen. Putting in a spring that shoot much more than 400 FPS will consistently strip the teeth on the spur and sector gears. The teeth on the stock plastic piston and bevel gear don't seem to get affected for some reason. So yeah, keep that stock piston.  |