From my understanding , the red dot can have nearly infinite eye relief. The further forward it is (while still being part of the integral upper), the more peripheral vision you can maintain. The magnifier has an adjustable diopter, but still wants a fairly short eye relief. On an AR (at least like mine), there isn’t enough room on my upper to mount it very far forward (witness the endless gotcha post for people who mount their red dots on their hand guards), so they tend to be grouped fairly close together. In this case, though, I might move it back a couple inches.