Norm, The Imperial proof instructions seem the follow the British standard that required pistols and revolver be proofed in a finished assembled state. This makes some sense for revolvers where it is usually the cylinder that is the weakest link. For Pistols this seems like the waste of a good action for a bad barrel.
Since the barrel was gauged before and after proof to insure it did not expand out of spec, the sensible approach would seem to be to proof a barreled action with a "proofing toggle."
But if this was done seems a mystery but the Erfurt proofed DWM LP08s combined with Erfurt production of tangent sight notched recievers when Erfurt was not making LP08s seems to suggest that Erfurt may have been the barreled reciever source for DWM.
This would call into question the real proceedure for proofing and marking the various components.
regards.
Heinz
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