I have 2 different sights for sale.
#1 Williams brand for TC octagon barrel muzzleloader fire sight set. Included front dove tail sight (3/8) fiber optic and rear adjustable base with 2 different apertures regular notch and a ghost ring type peep. both have fiber optic beads . $25 shipped.
#2 Skinner brand adjust able peep. The "860" model. Fits anything with .860 hole spacing. I had it mounted on a White muzzle loader. Web site says will fit Ruger 10-22 etc., many other rifles listed on their site. Complete with mounting screws peep aperture and adjustment allen keys. Like new condition. $55 shipped.