Expensive but works for me - Tyrant CNC 5 Round Magazine Extension for Glock

I’m LEO and wanted extra rounds in my duty gun. I have a flared Magwell and I’ve tried 2 other mag extenders which didn’t work because they were too large and rubbed on the magwell where the flared magwell is. They fit and work. I don’t like the price , the black has coating has already scratched up badly from everyday use.

I’d look at other options if you have a regular magwell