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I have been using my Bushmaster with the scope the way it came originally, but after a few outings I noticed that the sight plane was just too high for me. I noticed that the scope mounts are sitting on a pair of risers that could be removed to make the scope sit about 3/8" lower, which would be perfect for my desired sight plane. The problem is that the 2.5 mm allen head screws holding the risers on are so tight that I can't break them loose. I've applied all the torque I can without stripping the screw heads or twisting off the allen wrench and they still won't budge. Does anybody have a suggestion on how to remove them before I give up and drill them out?