They are more akin to a tapered grub screw @bigbear as they don't have a head on them like a screw.
It may be worth trying to find out the thread as they may even be metric not being an american rifle which may mean any engineering firm or bolt shop may have some to fit. I tried to remove my rail screws and check for you but I have loctited the shit out of them and they won't budge....
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