I put a cheap BSA red dot scope (non-magnifying) on my MK III because unless I was wearing my reading glasses, my iron sights were blurry and I was, to put it simply, dangerous. But the red dot allowed me to shoot decently without wearing glasses. So I used the red dot all the time. But as a trade-off, I noticed I needed to hold the pistol much steadier to keep the dot on the target. So I was heavily concentrating on trying to be steady and the more I concentrated, the more I shook. Well, after many trips to the range and thousands of shots, I tried shooting with the iron sights. To my amazement, I was much more accurate! I found I could now hold the pistol rock-steady because of all my practice with the red dot. In other words, it trained me to hold the pistol steadier...even without wearing my glasses. The red dot is still valuable for quickly getting a sight picture but I'm probably just going to stick with the iron sights for most of my practice.