For those who might have the same issue as I had, after a few e-mails with VFC customer service they told me this:
The 2 set-screws on the folding stock button (stock refered in the manual as part number PDW-37) are M4x4 flat tip set-screws
Also good to know:
Screw refered in the manual as PDW-10 is M6X16 Flat Socket Head screw
Screw refered in the manual as PDW-11 is M6X20 Flat Socket Head screw
One can find these screws for way cheaper than they are selling it on evike (we are talking 6-8$ for a pack of 100 vs 2$ for the individual set screw)
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