Just a thought on the red dot and those out there might chime in.
As I mentioned I was not a bit interested in co witnessing my red dot. (Russian Kobra purchased from Tantal before his passing) directions where in Russian. I don't even recall where the front sight was in the picture. Member at my club says he knows russian.
Translated it " mount silly dot , adjust to close to target, enjoy" He did help me though.
Basically he told me the recommended zero was 20 yards and this would give you hits on target out to about 220 yards +/-2.5" through out the range.
Thinking to myself out load I would set my rear sight adjuster all,the way back to the battle sight setting this is close to 300 yards and co witness the best you can on that.