I have the aperture sights from One Ragged Hole sights, on my Ruger SRH, and my GP100, had them also on my Ruger RH. They really work great, come in 2 sizes, I have the larger size on my revolvers, and they really improved my shooting, and they're great for hunting. Just go to the site for One Ragged Hole sights. I think they were $25.00 with shipping and all. Good luck.