Thanks MAH. I have talked with several users and some say they have found the red dots they have tried to be nearly worthless in bright sun in spite of brightness adjustments. Others report their red dots work fine in all light conditions.
I think my RMR is a 3.25 dot size and it does well in sunlight. I think you need to test the real thing, precisely, that you want to buy. The better ones are expensive. What is the one Whitworth uses a lot of? They are a tube with dot inside. My memory doesn't do as well as I'd like. Ask him as they are on some of his really hard hitters. Be Well, Packy.
Ultradot 30MM is what I was thinking earlier. Ask Whitworth if you want to talk to someone whom I know to have used it. It was on some heavy hitters if I remember correctly. Maybe our Moderator has used them. Be Well, Packy.