As I recall reading somewhere, almost all of DWM’s pre-war barrel steel (I want to say also all the gun steel writ large) was sourced from the Böhler steel corporation because of DWM’s exacting standards (and contract stipulations) for metallurgical quality. They are marked on some of the 1913 and 1914 guns as such, but almost all 1914 and prior Luger barrels were made with that steel. If I am incorrect I am happy to be educated as such.
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-QM
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