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Fox had a surplus of barrel steel post WW1 which they called Cromax which was believed to be SAE 4130.
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That is pretty much an Olde Wive's Tale. On a very high percentage of Fox Chromox barrels one can see remnants of the tube supplier's marking on the bottom of the barrels forward of the barrel flats -- LLH, SB&Co., the D with a three-lobed crown over it, etc. Over the years I've even observed barrels of early post WW-I vintage with vestiges of the
FLUID--STEEL--KRUPP--ESSEN markings on the bottom and roll-stamped
CHROMOX FLUID COMPRESSED STEEL on top.
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