I have shot about 400 rounds through my 9mm Shield. When the magazine is empty, the slide rarely locks back. Ammo is usually Winchester FMJ 115gr but have used various kinds. I estimate that the slide locks back maybe 10% of the time. I haven't worried too much about it because I don't carry any extra ammo for edc but I know it should lock back.
I wondered if the recoil spring is too strong and preventing the slide from going far enough back. It does eject normally. If I rack the slide back by hand with an empty magazine, it does lock back.
Any suggestions?
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