This replacement or spare magazine is compatible with your Ruger SR. It is constructed of heated treated steel with injection molded mag follower and mag spring formed from chrome silicone wire. Made in the USA.
Specifications:

Caliber	9mm Luger
Capacity	32
Finish	Blued
Model	Ruger SR9
Material	Steel
Type	Detachable
Model Fit	SR9/SR9C
Brand Fit	Ruger
Max Capacity	32