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FX Dreampup mystery screw help

I removed the stock from my Dreampup and found a grub screw setting in the stock. I fired it once this morning and all was fine. There are only two places I can see that it can thread into and the second pic (under the magazine) is the only one that makes sense. The last pic is the correct thread size but in the online manual for the dreamline there doesn’t appear to be screw in that hole. Any help is greatly appreciated!
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