I have a Trigger Master circuit in both my MP5s, mind you it's much more than just a MOSFET, and bigger, so yes a simple MOSFET will work in an MP5K, provided you can find a space to put it in, and have a safe wiring route from inside the mechbox to the MOSFET. Mine are stored in the front grip, and I ran the wires through the lower font of my mechbox, but had to cut a hole in the body behind the mag release to get the wires through.
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