I have to ring in on this. I've been building and shooting sine the mid 70's.
Now I am 71 and cannot use a notched rear sight. I make peep sights but mount them 8-10 inches from the breech. I do my shooting sitting on the seat of my walker as I can no longer stand sturdy enough to shoot off hand. I don't care if they're legal for competition or not as I have long since fired my last match relay. But the peeps do allow me to ring plates, roll cans etc in my backyard range.
Heck, I even put one on my NW trade gun last week.
My gun, my range, my rules...LOL.
Have fun while you can. Life is short.
Tony Maples