Hi Don,
There isn't as far as I know. But it certainly would have been a quite useless thing to do on sidearms that remained in police/military use.
So the most obvious reason for grinding off stock lugs is to make them less 'military' in appearance.
To my knowledge there is no specific law or rule that outlawed stocklugs on pistols on the German commercial market during the Weimar era, so it may just have been a 'cosmetic' issue, again pointing towards commercial (private) use. And the paramilitary party branches were (until 1933) private.
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