So I keep seeing these Electronic Speed Controllers and I am trying to figure out what makes them different from a Mosfet. Could anyone help me with this? Second, I put a M140 spring in my m14 running a SHS high torque and the gun still gives me overspin even with an 8.6 mah. Would a 7.4 lipo fix it? Or do I just need to get an AB mosfet. I'm trying to save up for a mission trip so cash is tight right now. Any help would be appreciated.