Originally Posted by Cattledog
It is still just a dot, a pure light version of open sights. Even with 20/20 beyond 75 youre approaching pure marksmanship and I'd put that around 75-100 anyway. Meaning, sight is less of an issue than skill beyond a certain range with open sights or a dot. With your vision issues, you should be looking at a good low magnification scope to get your clarity back.
I would disagree that a red dot is at all equal to open/iron sights. Those of us who predate the M4's and Red Dots or ACOGS know we can achieve far greater accuracy with irons than any red dot.
The advantage of the red dot is quicker "close range" target acquisition and far less training time needed to create competent shooters at the expense of creating competent marksman.
I'm certain the M4/Red Dot configuration has contributed to increased hit rates within the ranks but it's also caused Many, many M14's to be pulled out of storage and put back in service as DM "Designated Marksman" rifles which does contribute to a new logistical issue for Commanders.
The reduced range of the 14.5" M4 VS the A2 is a factor but the reduced emphasis on iron sight proficiency is also contributing the problem of effectively engaging targets beyond 300m