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Hector, this is correct. They will hold 21 rounds as they are 19rd magazines with the plus two extension. The number holes will not change. Cheers and stay safe!

Hector, they may be labeled 19rds, but they are actually 22rds with the extension. You can see a picture of the magazine here >>> https://www.springfield-armory.com/xd-series-handguns/xd-m-elite-handguns/xd-m-elite-45-osp-threaded-9mm-handgun .....if you zoom in on it, you can see it says 19 on the last hole, but it hold 22 rds. Have a great day!