When I went in Army was in basic with M16. Had little respect for it because of bad rep at the time. I had lot of experience with BA 222s and 220s before military. I was surprised of accuracy of M16. We didn’t shoot bullseye, shot pop ups out to 300 meters ( might have been yards ) I think 1st row was 25 meters. They taught us to shoot these by instinct with a rod that fit over sights. I guess optics is personal choice. For me deer hunting where shots are under 100yds and fast and furious the aperture sight is faster for me.