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Look at anything to do with an AK or G36 or MP5K (K not the reg MP5). They're basically all the same but with different gears on the outside. Those gears are for selecting safe/semi/full.
As said...and I can sympathize that you want to get as exact as a reference as you can before you dive into it, but bear with it...
1. Once inside...there are very few difference, and those are subtle, between the version 2 and version 3 mechbox.
2. The process of properly shimming a mechbox would be done the same regardless of version type.
3. There isn't a single written document or video that will be as good as a substitute for someone showing you how to do it and what it "feels" like.
4. It's ok to be nervous...because if you botch it, you could be in for a real headache.
and lastly...you can always put it in a bag and give it to a gun doc to fix...LOL!
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