Alvin,
One of the main reasons why you see a number of design changes (mostly improvements) after 1930 is basically due to one man: August Weiss.
He transferred from DWM to Mauser in 1930 and became foreman of pistol production, so not only for the Parabellum but also for Mauser's own pistols, the pockets and the C96. His thoughts on the quality of Mauser pistols were not too good initially and he probably used his position and experience to improve the quality and safety of the pistols from 1930 onwards.
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