This replacement or spare magazine is compatible with your Ruger SR1911. Made in the USA. NOTE: This mag is not compatible with the Ruger SR1911 Officer style model.
Specifications:

Caliber	45 ACP
Capacity	7
Finish	Stainless Steel
Model	SR1911
Material	Stainless Steel
Type	Detachable
Model Fit	SR1911
Brand Fit	Ruger
Max Capacity	7