Lee you are correct, that is the exact model I have. I called Ruger yesterday, I ordered the correct front sight from them, they had it in stock and will ship it to me. Still not sure if the sight on it is the correct one. I measured it and the blade only is .155, makes me think it is the correct one, I saw on a web site the 22lr front sight is .125, I'll know when my Ruger package arrives. I also tried swapping a sight from my adjustable sight Single six,other 32cal single six's and even my Mark II's the sight base is longer and using the original screw hole leaves the sight extending over the end of the barrel. The only way those sights would work is to redrill the barrel.