G 21 to 10mmconversion question...

[Citra47]

I have a gen 4 G21. Other than an aftermarket barrel (.45 to 10mm) and 10mm mags what else do I need to convert to 10mm? Do I need to change recoile springs & extractor? Any help would be appreciated.

[4949shooter]

You can do it with an RSA and extractor change. But I wouldn't use it for defense.

The best way to do this change for maximum reliability is to swap out for a complete G20 upper, which will fit right onto your G21 frame.

You can get the uppers from Glockmeister.

[jiminthe burg]

I have had good results with just using a 10 mm barrel. Used stock RSA and no FTE or FTF. I only fired a little  over 200 rds. Like 4949 said, I would not use it for sd.

[Citra47]

Thank you for the help.