Thread: Winchester 30/30

Originally Posted by Cigar

My mid-80's M94 had a "case coloured" action.
I think it's done by heating and dousing in oil or something like that? It has a rainbow look similar to spilt oil/diesel

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That's what we used to call 'case hardening' - when a low carbon steel is soaked at quite high heat in a carbon rich material such as bone, leather, iron filings, then quenched to give a hard wearing surface.
In this case it probably is just a heat application with chemicals and an oil quench - quite attractive