... I also hate to see yet another STAINLESS gun 'set-off' by contrasting blue controls, those things mostly likely to corrode fast with use! I wonder if the color-case is intact under there if you stripped that blueing off?...
True "color case hardening" has been a thing of the past with S&W since MIM parts. These are not case hardened, but just colored with dyes or some such (like Ruger and lots of others). That does not mean the parts are not good; the are! However, they are not color case hardened, just colored.