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Ok thanks. So the differences in shading comes from variations in carbon content in the steel in the case hardening process. I didn't know bone was used. Thirty years ago I saw a documentary about firearm manufacturing in Afghanistan. It was all hand work with files and chisels. To case harden, they would pack the components in cork fragments and bury the package in the coals for a period of time.
I remember watching the smith remove the parts from the cork and assemble something that looked like a 1911 (but I am guessing ) .They fired that piece as well as a knock off of an AK 47 they had made.
Best
Les
__________________
Best
Les
My train of thought has been replaced by a bumper car.
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