I just got a new XC. It has the Staccato® Tactical Optic system with the Optic-specific Staccato® mounting plates included. All good. The issue for me is removing the factory cover plate/rear sight in order to install the optic. I removed the single set screw in front of the rear sight. But the cover is stuck. Has anyone experienced this issue and if so, how did you get the cover plate off? Thank you.