The MP5K is a bit of a special case... it actually does use a version 3 gearbox. The wiring is a PITA, having the trigger assembly pop out on reassembly is a PITA, and trying to get enough compression to boost your FPS up to a respectable degree with the shorty ass barrel is a PITA. There's very little room to play with on the K.
[EDIT] Feh, Colin beat me to it.
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