Hi Rich, I believe the axle pin jamming problem only became an issue post WW1, when hot 9mm ammo, intended for SMG's, was used in Lugers. This was corrected by extending the rear of the frame 1mm, on all Mauser and Krieghoff produced Lugers. I have no idea whether Simsons were also lengthened. What do you say, Ed? Regards, Norm.
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