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About a year ago I purchased a 9 mm pro core thinking I would use it for three gun competition. I was never happy with its accuracy, so I got a pistol coach, did hours and hours of dry fire training, spent hundreds of dollars on reloading supplies so I could try different bullets and powder...

I have an M&P 9l mm pro core, with a half a dozen 17-round magazines. I recently started 3 gun shooting and wanted to add a couple of Arrendondo mag extensions. Arrendondo Magazine extensions increase my capacity from 17 to 22 rounds which was nice , but they would not allow the slide to lock...