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Hi Eric and welcome. Yes Sir, this is compatible with the Gen 3 21SF Pistol. Cheers, stay safe and enjoy!

Yes, this will fit and function properly.

Yes, it will.

Hi Eric, yes, unless you have the ambi mag release. Fits: Glock 21, 30, 41 Will NOT fit the 21SF with the Ambi Magazine Release Stay safe & have a great day!