Out of spec slide stop. The slide stop should hold the slide locked open and not be released by "inertia". The next malfunction you will see is failure to lock open on empty or lockback with rounds remaining in the magazine. I would get it fixed. It's not supposed to do that. Also slamming a magazine in with any more force than what is necessary to lock it in is abusing the gun and the magazine. It's just like slamming a cylinder closed on a revolver.
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