Single pin sight?
I'm looking into a single pin sight primarily because my eyesight is aweful and not getting any better. So if I understand there are sights that slide up and down vertically and I guess lock into place? On these sights I've also noticed stickers with numbers how exactly do you begin to sight this kind of sight in and do any of u guys use them? I noticed one on eBay I think it said it was totally tool less it looked like a neat idea