Pete,
There are undoubtedly countless things that could be wrong with a magazine and I'm sure that you have eliminated the obvious. I had a brand new Mec Gar magazine that failed to engage the hold open consistently. After much fussing I discovered that the forward edge of the follower button (the button that pushes the hold open up) was scraping against the slot for it in the frame. Lightly filing it down fixed the problem. You might try checking the magazine out with the right grip removed. KFS
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