I just recently got a computerized MOSFET switch from Extreme-Fire and it drastically increased my rate of fire. After toying with it for 2 minutes my piston looked like this:

One feature of this MOSFET is that it allows the user to adjust the motor speed in either direction. In the future, I will definitely be turning it down a notch

, but I was also hoping to gain some knowledge on full steel toothed pistons. Are they your best option for high ROF setups?