So my gun has this issue too. Didn’t notice it til an IDPA match. My gun will auto forward and the slide would hang up on the back of the magazine.
you can see in the picture of the bottom of my slide, the magazine rear lip was rubbing pretty good.
a quick stint with a dremel fixed the issue. Some required a tiny bit and some required a lot. Just a bummer I had to grind on all my $35 magazines.
this happened with the mecgar plastic basepads, the aluminum canik basepads and some henning basepads.