My guess would be because of what the BU stands for in BUIS. Back UP. They are not meant as a primary sighting system. But that's just a guess.
I must be missing something. All of my BUIS have an elevation adjustment in the front sight.
... All of my BUIS have an elevation adjustment in the front sight.
I have a attached/permanent front sight that has the little pin one would push down to adjust the front sight. Not exactly a quick adjustment. I understand that they are back up sights but back to the old saying, "need it but don't have it." I have never used a red dot, correct me if I am wrong, but red dots are only good for 300 yards or less. Aim higher, I know. I easily hit 10 out of 10 at 500 yards with iron sights and would like to keep that capability.
I have never used a red dot, correct me if I am wrong, but red dots are only good for 300 yards or less.
I would like a folding sight ideally but not a deal breaker. Again it is ignorance on my part but I assumed one would have to have a folding sight to pair with a red dot.