If your mp5 is of the clear variety available at walmart or cdn tire, a standard mechbox won't fit. Their parts aren't replacable or compatible with anything. Onceits dead, it's dead. Also, while mp5 and m4s share a V2 mechbox, there are different parts like the trigger, cylinder, and nozzle. So even if you had a TM compatible mp5, that box wouldn't fit.
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