Thankyou !
It was done by Drake at
Drake's gun works, but as there are only a couple of large industrial facilities that can perform the process, I'm guessing he likely sent it out to
Coal Creek Armory.
I posted a 14K round teardown about a year ago
right here, but the pics are rather helpfully not there anymore....
My NH has Ionbond on it...and the watch in the picture is ceramic ( zirconian oxide ). It's just slightly less hard than a diamond, but it has zero elastic properties. If I drop it from a decent height onto a hard surface, there's a good chance it will splinter, perhaps shatter... not so good for guns....

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