This JXM-1 rotary replacement or spare magazine is compatible with your Ruger 77/22, 77/17, American Rimfire. Made in the USA.
Specifications:

Caliber	17 HMR/22WMR
Capacity	9
Finish	Black
Model	77/17, 77/22
Material	Plastic
Type	Rotary
Model Fit	77/17, 77/22
Brand Fit	Ruger
Max Capacity	9