Hi Jerry....
Really - based on your post, I wouldn't do a thing to the gun itself. Since the original Luger mags work fine, and since it seems to jam with only aftermarket mags - I'd stick with simply focusing on those aftermarket mags - and I think you are on the right track with the springs... With a full mag - a weak spring will definately effect feeding relability - and you may *not* be able to feel the tension difference (by hand) of an original and aftermarket mag..
You may also just want to do a quick check on the after market mags to be sure that nothing is hanging up the magazine follower as it is depressed way down in the mag. (Look for bright spots inside the mag body where it could be hanging or spurs, etc.) Other then that - I really think you are on the right track by changing the springs themselves....
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