Your mechbox is a version 2...and aside from some very slight differences in some parts (i.e. m4 selector plate vs. MP5 selector plate, etc...), they're all exactly the same.
The closer pack of coils on the spring go towards the rear (at the spring guide end...not the piston end).
I cannot recall how similar or disimilar the your MP5 is to a TM MP5 (might be more similar to a CA MP5...my brain is a blur now). Google/Youtube/Mechbox.com your specific model...and you'll probably find something. If you don't find a perfect match...just watch/review the other MP5 disassemblies, it won't be too far off from one of the others.
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