This replacement or spare magazine is compatible with your Saiga. It is constructed of DuPont Zytel polymer with injection molded mag follower and mag spring formed from chrome silicone wire. Made in the USA.
Specifications:

Caliber	223 Remington/5.56 NATO
Capacity	30
Finish	Black
Model	Saiga
Material	Polymer
Type	Detachable
Model Fit	Saiga .223
Brand Fit	Saiga
Max Capacity	30