One of those screws would move the sights left/right and the other would move them up/down. I don't know which one does what as I don't have a GLOCK with adjustable sights on it nor do I have my GLOCK manual handy. I know that someone (and perhaps several) people on this board will know the answer far better than I can ever answer. Just hang in there and someone will answer your question.
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Stuff I have little time to play with:
GLOCK 23
Springfield 1911A-1
Browning Buckmark
M1 Garand
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