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I don't press check and it could have been gummed up oil. I use Break Free, too. I failed to mention earlier that this happened in a LW barrel. It had not been shot much either.
Here's something interesting that happened when I changed back to the Glock barrel. I locked the slide back, dropped the round in the chamber, and released the slide lock. Slide slammed shut and the round dropped out the mag well. How did that happen?
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Will second what everyone else is saying. When I first started carrying a handgun I thought this was the appropriate way to get mag capacity+1. But, it is almost universally harder on your extractor, and guaranteed it's harder on the rim of your case. Do this to the same round a couple dozen times and you'll find yourself with a real chewed up case.
I now typically slide-lock the gun, insert a full mag, now I can visually verify there's a loaded mag visible through the ejection port. Then send the slide home to chamber a round. Eject the magazine and either swap with a fully loaded one, or top off that mag, re-insert, press check, holster. Done.