Thanks for the pics!
This is an odd modification. Like you, I can see no need for it. Do the tops of the grips still 'tuck into' the frame as the P08 Lugers do??? Are these pins supposed to stop grip movement???
It was in my mind, following recent postings in the For Sale forum, that I might like to purchase a nice Interarms Mauser Luger. Now I'm not so sure.
The straight-cutout grip mod did not bother me too much as I saw that Numrich had new Interarms grips, but now I wonder what other 'improvements' Mauser made???