Any chance you can tell us how deep that optics cut is?
I gave up on having buis since I have a Delta point. But then I saw some red dots with integrated rear sight. I'm wondering if I can simply mark or mill a straight vertical line on the back of the Deltapoint. And use the tallest front sight I can find, 8.5mm I believe. So in an emergency, if the red dot goes down, I can line up the front sight to the line on the back of the DP, and when the tip of the front sight is in view, it will roughly get on target.