Yes as long as they are stock no grip sleeves. I use 19&17 mags in my 26 frequently.

 

I use 17 mags in my 26 and my 23 when shooting 9mm. I also use full size 45mags in my G30SF. I figure if I'm buying extra mags, buy ones that you can use in everything.

 

Kind of like the postal service slogan...if it fits, it ships. Several of us shoot G30s in GSSF with G21 mags. I've never found deals on G30 mags, and the G21 mags give a little more to hold onto.

 

I use G17 mags in the G19, G19 mags in the G26 and G21 mags in the G30

 

Hi,
Always used them -Idpa and Uspsa matches in the past made me go to Match Director's for it in big matches.
"It fit's the box it is good"
Just look for Major shooting only 7 rounds and not the max in a mag! Like above no sleeve's.
Mike