I have used both Williams and Lyman apertures quite a bit and love them ( I sometimes forget without looking which rifles I have wear which...I have used them on Mausers, 94s, Krags, and on my Lyman Great Plains caplock, which I shoot in league with. If you arent used to open sights, they take getting used to, but much greater accuracy potential than with just open buck horns....Hey, Just ask Quigley!