Your reddot mount might have it's height adjusted to cowitness with a front barrel site post.
Does anyone know anyone who actually switched to the BUIS mounted as back up to a scope when out shooting or hunting? I used to mount them but then ditched them altogether on a scoped AR.
You might want to see if you can scooch your scope forward a bit to clear the charging handle better (you'll need a cantilevered mount or ring).
The dot is about 1/4 inch above the front sight post. It came with a lower mount but I think it's too low to use on an AR.
I may never use the irons but since they don't interfere with anything they're there if I need them.
The scope really doesn't interfere with the charging handle and I have good eye relief where it is. I'll mostly just use the red dot but if I want to touch something way out there I'll use the scope.