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4140 is really the standard steel for guns. I believe your 7012 is actually 7012–T7352 alloy for guns. It is a good alloy, I machine a few things from it now and then. It is a aluminum, iron and silicon alloy, not sure of the percentages any more.

Jerry
 

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Any Steel and most metals can be polished to a mirror like finish. It does not have to be chromed to look shiny. 4140 is a chromium steel but it is for strength and not finish.
 
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