Ive got ageing eyes and still shoot in pistol competitions and was wondering if a red or green dot might help ? The problem is, I don't know what sight base or low mount dot sight will work on my gun? Here is what I have and any help would be great appreciated. 1911 Rock Island Armory/Citadel model Novak cut rear sight What I need is the rear sight base and the dot sight to match and hopefully with a budget of $150 for both. Suggestions ?