I have a M29-2 with an 8-3/8" barrel that I want to mount a scope on. Are the "non-gunsmithing" scope mounts worthwhile? If so, which one is best? I'll have it D/T if I have to. The revolver does not have much collector value since, sometime in its past, it rusted bad enough to become pitted and has since been smoothed out and refinished. What do you all think?