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Daniel, yes Sir. G21 mags work perfectly in the G30. The distance to the mag catch is the same. Cheers and stay safe!

Daniel, sure will. Glock 21 magazines will fit the Glock 30 no problem. The only issue you would have is if you reverse the magazine release and put it on the right side. Hope this helps.

Yes, this will function properly in a Glock 30.

Daniel, yes your Glock 21 magazines will work in the G30. Have a great day!