melonite/isonite or Ionbond is about the closest you'll get other than for the "sandable" bit.
Melonite /isonite/E-treat is a treatment, not a coating. It does indeed alter the steel at the molecular level making it much, much harder to the point where it is virtually unscratchable. The color can be varied from dark charcoal to deep black to almost blue.
The surface luster or shine is dependent on the metal prep work, if it's highly polished the resultant finish will be shiny, if it's media blasted, it'll be accordingly dull.
It is insanely more scratch resistant, rust resistant and easier to clean than stainless steel and it can be applied to either carbon or stainless.
I have 18K rounds and 2 1/2 years of carrying my melonited stainless CBOB and it shows neglible wear outside or on the rails.
Ionbond is a PVD coating but it is similarly hardwearing, with the advantage that it can be applied to aluminium and other alloys
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