Converting a G21 to 10mm? [Archive] - Glock Talk


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08-02-2012, 06:55
If I want to convert a G21 to 10mm, what do I need to change?

Are the lower pieces (frame and everything in it) all the same? Same ejector?

Am I best off to just get the whole G20 slide? Or do I just need to change out some parts of it?

Thanks for any help.

08-02-2012, 07:50
Take a look at the post linked below. It will answer many of your questions and give you the options and costs involved:

Converting the Glock 21 to 10mm Caliber (

08-04-2012, 06:52
Thank you for that. Very useful information there.