Id say its simpler than an M4, because you dont have to worry about wedging in that upper onto the gearbox, then wedging the gearbox + upper into the lower (metal) or stressing the tabs to snap it over (Plastic). with the MP5 metal or plastic, you just screw it inside the upper. The hopup assemby etc would be the most complex thing on the MP5, and its not really even that complex, most of the parts are common sense. The only thing i can think of with the MP5k is when i was at TTAC3 and I think it was colin (i cant remember for sure) who was reassembling someone's MP5k and there was some difficulty stuffing the wiring back into the the short cocking tube space.
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