I can't argue that.

OTHOH, every re-do I've seen (I have 4 by 3 different finishers) is blued. And if I were just guessing, I'd have guessed they were blued. What practical reason for case hardening? I wouldn't think any one would be unique to a gun and it just seems logical that a safety button would fit in the small parts category with triggers and screws to be blued.