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I have a P220 that I got in a lot a few years ago. I pulled it out to clean it, and when I loaded an empty mag in it I noticed that when pulling the slide back, the slide catch would engage. This only happened with the mag inserted. If I removed the mag, the slide catch would not engage. I pulled the slide off and inserted the mag and could see the side of the mag push the catch up. Both mags did this, but I realized neither of them are marked with any SIG markings. I an thinking of getting a SIG branded mag to test it it, but since it'll run me about $50, I figured I'd get some opinions.