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I bought 3 Magpul 15-rounders for my Glock 19 gen 3 when they were on sale at Bass Pro a few weeks ago, and shot them for the first time on Friday... and that'll be the last time. I hadn't noticed this thread before I had gone, but I had a stovepipe or double feed at least once a magazine. I was shooting with a friend who hasn't shot many guns other than 22LR over the years, so I had figured he might've been limp wristing with a 9mm, but it happened with essentially the same frequency with me, and I couldn't remember the last time I had either sort of failure with that gun. I grabbed a couple of OEM mags at Academy this morning to replace them ¯\_(ツ)_/¯

Edit to add - I've had nothing but good experiences with Magpul AR mags, like pretty much everyone else on the thread. I guess Glock mags just really need the metal feed lip inserts.