Thanks for the welcome. I'm N of Raleigh and ESE of Creedmoor.
I checked out pics of what you are describing. In comparison, the lens of the Aimpoint appears to be higher off the rail than the Bushnell TRS-25, which is overall smaller and is about as close as you can possibly get to the rail. I could buy the Hi-Rise Block that is made for this sight to bring it up to possibly co-witness with the iron sights. All this is not really going to help me put a magnifier behind it though, but then again that is an afterthought. I have to keep reminding myself that I'm getting older and my eyes need help.
My intention is to NOT change this rifle as it is configured. I got it from my Uncle who was in the Vietnam War and even though it is not exactly what he used, it is close enough for me to invoke memories and pay respect to his service.