I have a G23 and G27..I got a .22 conversion kit for my G23, it was a great investment. I plan on getting a 9mm barrel for my G23, since you can convert it to shoot 40cal, 9mm, 357 sig and .22 cal as well...One gun that has 4 calibers....You can change the slide out for the .22 in seconds and have it ready to go. I have 3 mags for the .22, you really need several of them. It is a pain to load the .22 mags without the mag loader that come with the conversion kit.
I have 6 - 10rds....6 -13rds...all for the G23.. and 4 mags with finger ext, that holds 2 extra rds for the G27..I plan on getting more mags. I bet before to long high cap mags will go up again..well, I know they have...I saw them for 30 bucks the other day online..I paid 15 bucks for mine...