You'll need more than a simple mosfet for 11.1 to work in your gun without destroying it. Get a trigger master, then a wolf-dragon PCB with auto-cut off.
The trigger master will make you able to tune your motor speed and the PCB will keep you from exploding.
Also -- All the 7.4 Lipo that I've seen have been extremely slim.. Smaller than a standard mini battery.
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