In talking with some other collectors in Germany who have much better information than even I do about the barrel steel sources:
Böhler as a contractor/supplier of steel has been secured. DWM also had close contacts to Krupp, Essen and as we know Krupp was a common supplier of barrel steel. For that Krupp/Essen as supplier of barrel steel for the DWM was probable...Further Mannesmann had close Business contracts with DWM at this time...
Means:
Böhler is secured
Krupp/Essen is probable
Mannesmann is probable
We know that the barrels of the P04 should be made with Böhler steel, the same material that was used for the rifles 98 and some DWM barrels in 1913/14 show the Böhler numbers. May be it changed in 1911 when Erfurt rifle factory began to made Lugers too. But I think it's possible that DWM used only Böhler steel.
This is from Klaus and Tom Pompe over in Germany.
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-QM
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