I would check to see if the EGW rail is set up for the heavier 8-40 screws. If that is the case the best thing would be to have your action re-tapped for the heavier screws as they are more reliable under recoil. Otherwise I would exchange the rail with EGW for one that will fit the factory threads.
As far as removing the "dummy" screws. I believe the are most likely set screws filling the holes since the HH comes with Iron sights. They're most likely going to be allen head screws. If you can't see the top of the screws use a flashlight to identify before attempting removal.
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