I have that motor in an ASCU build and it doesn't have all that much torque. Pulling an m120, it can over spin and back spin way too easily. I've gone to the G&P m170 and it seems to control over/back spin without issue.
http://www.airsoftparts.ca/store2/in...oducts_id=1846
The higher the torque, the harder it will be to turn the pinion gear over by hand. More torque also means stronger magnets so it will stop soon when power is cut off. That G&P m120 turns way too easily by hand.