color case hardened AK receivers?

[headednorth]

Possibly a dumb question, why no cch AK's? Ive searched before and all Ive really come up with is some pics from a video game it looks like. Are there none out there? Does it have something to do with the case hardening process and the heat treatment for the holes for the trigger group pins not being compatible? Am I the only person with such atrocious taste to even envision such a thing?

inb4 nyet rifle is fine