I'm about to send off my ps90 to be engraved for SBR, and I cannot get the rail off. The front screw came out (at sight adjustment) but the screw on the TOP of the rail towards the rear, will not budge. The screw even seemed to strip the hex opening a little so now the allen key wiggles in the hole and won't grip. $%#$%#$. What do I do now other than spend a few hours with a dremel and a cutting wheel and SLOWLY cut the rail off?