Before anyone ask, I do not own this nor is it in my possession or I would have better pictures.
I have asked the Stoner guru and he is equally baffled so I am posting this to see if someone else might know information about it.
The stock is for a Stoner 63 and it has a radio in it. The owner actually has 2 of them so its not a one off. It was also done for military and not civilian. The stock is in Europe and may be of over seas origin.