I agree with Carpetsahib comments about the rear tang treatment on the Mauser action.
I have observed that the commercial Oberndorf rifles made prior WW1 have their rear tang slimmed down and polished in the white.
Such an alteration allows a better transition to the grip and in no instance weakens the action or the stock.
We apply that modification to the rifles we build, taking care to bevel the sear-contacting surface of the cocking piece and we have never encountered jamming or mangled stocks.

DORLEAC
www.dorleac-dorleac.com

1911 Oberndorf Mauser rifle

circa 1930 Oberndorf Mauser rifle

D&D Mauser rear tang treatment