[ujiro]

Oh, goodness. Upgrade them. I stripped my TM gears running a ~390 setup after about 20 shots. They will strip, not a matter of if, but when. And it will be soon after you put that spring in. They can't handle stiff springs.

Get SystemA gears, imo. They are good good quality. My favourite that I have worked with so far.

edit: well, look around at reviews of different gears and decide for yourself. My opinion is, Systema