Originally Posted By Citadel-SC: Given it’s reversed on the milled rifles it has to be for the pin as it would be on that side reversed or am I confused lol.
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Yeah, that's the only thing I can think of. I forgot that it was reversed so even that stock slack take-up screw wouldn't really make sense.
Some countries require folding stocks have a mechanism that prevent firing if the stock is not locked into the open position. Maybe that holes was for that?