The Lyman Muzzleloader Fiber Optic Sight Set fits Most European Imported Muzzleloaders. Now, black powder hunters can update their rifle sights with state-of-the-art fiber optic technology. These new Lyman sights let hunters take advantage of every minute in the field. They are especially helpful in dawn and dusk periods when game is most active. Designed to fit the Lyman Great Plains, Trade and Deerstalker Rifles; these bright, light-gathering sights will also fit most other European-made black powder rifles.