Poncho, you have no idea how different this mechbox is compared to other known mechboxes! It's a totally new design, it's completely rectangular and super easy to remove and take apart/reassemble. Best yet, the spring doesn't get put under any tension until after you reassemble the mechbox. It's not even a TM Version 6 that fits in the P90 (as assumed early on. I'll take a pic and post it, there are no compatible parts with this and other mechboxes except the gears and some other internals. Even comes with 8mm bearing bushings!
Edit: Here's the pic. Note I didn't bother putting the spring guide in this pic.
Anyways, Apoc just took the switch to Active Electonics here and found an identical switch and dropped it off. Here are the replacement specs on it for those that want a spare or to replace the exisiting one. The stock one is XURUI XV-152-1C25 (good luck on an internet search!!!):
GC Switch #35-844
Momentary - Miniature Snap Action Switch
SPDT (Single Pole Dual Throw)
Actuator: Lever
Cost is $4.49
This switch is identical, even down to the mounting holes. Good news for all the new CA M249 owners out there.