Most good mounts i.e., Leupold, Burris, T'SOB, etc. will have to be drilled and tapped for the mount. I have an old B-Square mount that requires no gunsmithing. Just remove rear sight but, I don't even know if they make it anymore. I've had this one about 18 yrs. It's the only one I know about that doesn't take some gunsmithing...Welcome...KRal
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It takes 43 muscles to frown and 17 to smile, but only 3 for proper trigger squeeze.