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Seems to me that metal mags would be more prone to overinsertion. it also seems that a good mag catch would stop most overinsertions.
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Well... sure I could see that. but really if you take a grown man and he slams a magazine into the well with significant vigor, it's kind of asking a lot for that little bump to stop it. To be honest, now that I think about it, I'm kind of impressed it works as well as it does, as often as it does.
A couple generic internet photos:
But I see what you're saying. It sort of seems like the metal should hold up better - I guess. Then.... well take a look at the mag on the left, and tell me that doesn't look like some kind of wear. Anything that diminishes that surface from being perfectly square, is going to be susceptible to letting something slip when you slam the Hell out of a Mag. So I can see Magpul's response.
My PMag has gotten ever slightly worn there at the insertion stop bump, which I suppose didn't help. Most of the time it would never be the issue, but a real heavy slam, and wups - over-insertion. I could complain about the PMag, but then, maybe a GI of similar age and use would have done the same. And that $18 PMag has outlasted a $300 Barrel, and it's about to outlast another barrel and a bolt. That's.... pretty darned good!