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A Garand is a long way from a 1911. I have done both color case and used Kasenite on small parts. Some of the small parts were case hardened on the .45, but not the frame. I am not a heat treater, that is it's own business, but I have had to dabble in it because I am in the machining business. If you knew anything about case hardening, you should be able to pick it up and "Feel" if it was cased. Even high carbon steels feel different once you bump them up to 50 RC. If anything, 1911's were probably 4100 series steel with a mild HT. Plain carbon steel 1214-1040 would probably have galling problems once you got a little grit in there.
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