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Can we presume you used the same ammo in the new one as the others? Often it's the ammo that trips the slide lock. It still could be if the new magazine is holding the cartridges slightly more to the left of center than the others I guess. Somehow. Doesn't seem likely though.
This usually occurs from:
The ammo hits the slide lock protrusion as it feeds.
Your thumb is engaging it during recoil.
But in your case it should be neither as you don't have the problem with other magazines. Carefully compare the bad mag with a good one. Something is different up there at the top.
Does the mag lock up tight?
This usually occurs from:
The ammo hits the slide lock protrusion as it feeds.
Your thumb is engaging it during recoil.
But in your case it should be neither as you don't have the problem with other magazines. Carefully compare the bad mag with a good one. Something is different up there at the top.
Does the mag lock up tight?