Been a few months and I haven't had any more failures since that first time using them. I do get a "gritty" feeling as I load them and the spring compresses. I took them apart and didn't find anything wrong inside.
And even though I wasn't too impressed with them, I ended up buying 2 Promag 17 round magazines for a surplus Beretta 92s that I recently bought. Magazines are hard to find because the mag release is on the heel of the grip. I found 2 at my LGS/indoor range, so I grabbed them. Those work fine.

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