Pro Mag drum replacement or spare magazine is compatible with your Glock 22/23. It is constructed of DuPont Zytel polymer with full length steel internal insert, injection molded mag follower and mag spring formed from chrome silicone wire. Made in the USA.
Specifications:

Caliber	40 S&W
Capacity	50rd
Finish	Black
Model	Standard
Material	DuPont Zytel Polymer
Type
Model Fit	G23
Brand Fit	Glock
Capacity	50