So I recently upgraded my Classic Army M15A4 spring to a SHS M130 and when I went to test it out, the gearbox would move a little and lock.
The gears had already been upgraded, although I don't know what the ratio is (it was a while back and a Airsoft Atlanta fixed my gears after they had worn out), the stock motor is in (this one), and my battery is a Tenergy 9.6v 1600maH 10C.
I figure that I either need to upgrade the battery or the motor, and would rather do which ever is cheaper. Does anyone know which I should upgrade? When I changed the spring everything came out and I had to re-shim the gears. I think I did it alright, but maybe doing it better would get it to work? It works with the stock spring shimmed the way it is now.