I have a 1" Rock River Arms Hi-Rise Scope Mount. I am trying to remove the screws on the mount so that I can insert the scope. I was able to use a Torx T20 to remove 2 of the screws, but the other screws wont match up to the torx. I think they are Hex screws. Does anyone know the size of the screws? 5/32" and 1/8" and 3/16" don't fit correctly. Here is a picture of what the screws look like.