Hi Tim,
The register marks on Navy barrels and receivers were applied separately, as close examination of many guns has revealed. The fact that a gun has register marks that appear to be the result of a single strike proves nothing.
Just because a barrel is 6" long does not make it a Navy barrel. You will note in the photo of a typical Navy barrel assembly, that while the serial number shows halos, indicating that it was stamped after bluing, the Crown/M Navy inspection mark does not, showing that it was applied before finishing. No Navy barrel left the barrel shop without passing inspection, those that failed were scrapped.
Regards, Norm
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