To me that looks like damage from the slide hitting the mag lips. Or vise versa.
Worn mag catch or worn mag catch slots in magazine allowing mag to be seated higher than normal. Smashing mag into gun when slide locked back.
Could be wrong as you would normally see where the mag has hit the slide further back from speed reloads.
Edit: Just looked at a gen 4 19 I hide at the back of my safe.
I can't see how a mag would do that damage as on the 19 it is only plastic parts of the mag that could contact that area.
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