For those of you that still have ARs with fixed iron sights, don’t forget that there is such a thing as a gooseneck mount.
There are a great many surplus gooseneck mounts out there. Some can be purchased for less than $10 shipped to you. I got the one pictured above for $8 shipped to me.
There are a few different heights, not all allow for using of iron sights, but they will let you mount a full sized reflex sight such an an Aimpoint, or Eotech (don’t use an Eotech).
Might not hurt to have one around.