Case hardening isn't an applied finish, it's like a heat quench. Like a box of chocolate, you never know for sure what your gonna get.
That being said, a closer look seems to be in order so when spots are completely missed it gets a do over or something.
For a long time you never saw a case hardened slide, only frames. I always figured the heat would mess with the hardness or something on the slide. They must have figured out how to do it without negative effects.
In Memory of Paul "Dietrich" Stines.
Dad: Say something nice to your cousin Shirley
Dietrich: For a fat girl you sure don't sweat much.
Cue sound of Head slap.
RIP Muggsy & TMan
"If you are a warrior legally authorized to carry a weapon and you step outside without that weapon, then you become a sheep, pretending that JOCKO will not come today."