I have a neighbor who has a custom Ruger Mark II 22 target auto. He has a Crimson Trace grip red dot laser on it and I love the set up. I want one for my Ruger Mark I Targetwith long barrel but Crimson Trace says it won't fit. Yesterday we took his grips off and they fit on my old Mark I perfectly. I have sent questions to Ruger about my Mark I because Crimson Trace does not know the reason why they would fit. I read where steel frames might be different than others. Do some Ruger 22 autos have an aluminum frame. We tested my Mark I with the Crimson Trace laser and it shot fine with a working laser. I do not understand why the C T company says it will not work when it works fine. I'm going to order the grips for a Mark II and put them on my Mark I.