Hi,
I agree that the 'jig' problem needs some further investigation. I'm still waiting for some photographic documentation of the stuff the Swiss sent to Mauser. As far as I'm aware, Mauser just got the jigs, not complete machines, as Parabellum production, like most guns, was mainly done on relatively straightforward machinery.
Mauser would have worked according to the german DIN norm, of which the foundations were laid by it's original parent company, Ludwig Loewe & Cie. in the early 1900s. The Swiss used their own SNV norm.
The choice to go with the Swiss design was not that strange, considering the high production costs of a Parabellum. Mauser sought to drastically cut the number of machining steps from the over 750 steps needed originally. The Swiss already had optimized production with their 06/29 design, after all, so that would make a good starting point.
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