You know, now that I think about it Niner ... you may be right. I think that Model 60 came with a tiny, piddly-assed scope from the factory. I'm not sure I ever changed it. It's been so long ago (it was my first .22) that I just don't remember. It seems maybe the rails were narrower than the standard rail mount for Weaver rings. (sucks to be a pUmpHEaD)