Who knows which 106 mm RR is correct (Academy, AFV Club, Verlinden)?

I have no idea if they are dimensionally correct and if their details are correct. I have all of them and it seems to me that the best one is AFV´s.

Besides that I haven´t found any photos on how the electric wires go.

I would appreciate good references (photos, drawings, etc).

Maybe this document can help you:

https://www.logsa.army.mil/etms/data/A/026475.pdf

You need to accept the certificate prompt, that will show up, to see the document. You also need Acrobat Reader software.
This is one of Techcal Manuals for M40A2 and M40A4 rifles. Only this one is publicly available, access to others is restricted...

Pawel