Ron, If we accept the premise that the mark was struck before the barrel was removed for machining the front sight, the mis-alignment would occur then. I think this highly unlikely because it just does not seem to make production sense. How would the sight be marked for vertical? By another mark on the top where the sight was to be machined? Why then witness mark the bottom until re-assembly? The witness marks on my two P08s do not appear to be well enough centered to serve as a mark for aligning the sight machining. They appear to be struck freehand.
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