Pro Mag drum magazine is compatible with your Glock 22/23/27. 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	10
Finish	Black
Model	Glock
Material	Polymer
Type	Magazine
Model Fit	G22/23/27
Brand Fit	Glock
Max Capacity	10