This replacement or spare magazine is compatible with your Saiga 12 gauge. 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	2.75" 12 Gauge
Capacity	12
Finish	Black
Model	Saiga
Material	Polymer
Type	Drum
Model Fit	Saiga 12
Brand Fit	Saiga
Max Capacity	12