I just finished installing an XCORTECH XET304U mosfet, 11.1V lipo, deans connectors and 16 gauge wiring in my Cyma cm028. The rate of fire has gone up from 11 rps to 19 rps and the trigger is much more responsive so a win so far.
I've been reading that some people remove their fuse to reduce the resistance in the wiring. However I wanted piece of mind and in my search for an alternative I came across polyswitches as low resistance and resettable alternative to fuses. I connected two 16V 10A polyswitches https://www.ebay.co.uk/itm/153536855033 in parallel and the gun seems to work