Tom,
No, I don't think it was locking in recoil, although I have had that happen with other guns. Every premature holdopen was after ejection of round #7 in the mag; i.e., with one round remaining and the follower button extremely close to the holdopen piece. And holdopen spring tension was actually not even so bad before I stiffened it.
When I tried a mag from my artillery, there was no problem.
Since I adjusted holdopen spring pressure to be the same as on my other two Lugers, and also carefully tweaked the mag lips to match my other original mags in cartridge positioning, I have not had one of these premature holdopens in several hundred rounds. I think the lips were the main problem. With the rolled seam running up both sides of the body, adjusting the lips is tricky.
In that regard, though, I have to agree with those who say that the true fix for any Luger original magazine problem seems to be these Italian Mec-Gar mags. The design lets the lips do a better job of positioning the cartridge correctly, and their springs are fine.
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