I found possibly a good deal on a 4506, but need some input please. It has the metal sides around the combat sights, sorry for the inaccurate terminology, are these a plus or minus? I have never used sights like these and some 4506 have them I noticed, rear sight btw. It also has the smith and Wesson logo/seal on the slide, left side? I noticed that doesn't seem common with all third gens. Gun is 95%, blue s&w case, 3 factory mags and paperwork for 500 once shipped and transferred. Good deal? Do those features make this gun any more/less desirable. Looking at same condition 4566, which one guys?