I can't contribute much here, I am not a gun tekkie
but if you need a Interarms Luger to test something let me know. My gun was made in October 1971 according to
this post .
GT has recently fixed some mags for me. Two were mecgar mags which jammed after a few rounds. The first fix didn't do it so I send them back to him and he exchanged the springs for much stronger ones, also fixed something int he original mags (thanks GT
).
Anyway with the ultrastrong springs 4 out of 5 mags now work without a problem with Winchester ammo. I don't know if he put in other followers or if they are still the mecgar, GT can tell more. One of the mecgar mags is still jamming after 4-5 shots, the other performed fine. the original mags that came with te gun now work fine. I guess they were of better quality as the first dutch ones.
Anyway I just wanted to say, if you have anything you want to try out in a 1971 Luger, I'm willing to help. I got so much help in this forum that I thought I offer to do something if you need anything