yes, you have it all set up at the right height and size and use the peep to help line up
You are not supposed to have a sight on a shotgun because you don't aim when shooting. You can however use a bead, black or with some color to help you. If you however look AT the bead you will be too slow. or you can use a holographic sight like the Redring sight where you don't look at the sight but keep focus on the target and still have a ring letting you see where the burst spread pattern is.
look up the sight, if blocked unblock the site with parental controls
Look through your iron sights, or plastic sights, or whatever.
Have never seen an ad as you have described- sorry
no
look through your sight
Holographic sights tend to be used on weapons and are primarily used to look through glass. They are also more accurate than iron sights because a red dot will appear where you wish to hit.
i would look to gunbroker.com,and look under gun parts/sights. E-bay may have one also. Numrich (GUNPARTSCORP) has some of the parts, but not the discs.
most of them were iron sights, very primitive v notch or battle sights
you can go to the island nearby that sit in the nile and go swimming in one of the beaches. look at battle sights. see al-mahdi grave sight, go to the local markets with great items. see presidential palace, etc.
You are focusing on the sights and not the target.
You can go to multiple Twilight sights, all you really have to look for are twilight fan sights.