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- nozzle
- selector plate
- safety
- trigger
- trigger spring (MP5 vs. M4 are different...not sure why...)
...and match the cylinder to the barrel length (you're going with a 363mm M4 barrel...which usually has a ported cylinder). Not sure what effect the bore up cylinder (for M16A2/SR16) will have with that length of barrel. Bore up nozzles are different from regular nozzles...pick the right one.
Depending on how you run the wires...you might need to relocate the mosfet.
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