Has everyone forgot the reason the peep sight works so well.
It has nothing to do with focus or visual sharpness on the aperture and everything to do with the eyes natural tendency to center something in a circle.
Nope. That's only part of the reason. The visual acuity and the parallax free nature of it is the rest, and for aging eyes .........the main reason. Look through as set of irons with a notch and post and notice the blurriness of the front post. Then look through an aperture sight at the same size post on the same length barrel and you will readily see for yourself how much sharper the front sight is through the aperture. Rifle and pistol shooters have to maintain sharp focus on the front sight as the shot is triggered. That is the wing shooter's anathema. Do that with a shotgun on a bird and you will shoot behind it every time. And
THAT is why I think it's useless on a shotgun. But then, maybe the gun was built for a tUrkey hunter, or someone else who shoots sitting game. Still a stupid idea to have it on a moveable part of the gun like the top lever.
Take time to read the explanation of how that works, in the article I linked to earlier in the thread. It's not that long, and it's well written.
SRH
