It does not use the glock magazines from FAQ " Frequently asked questions about Grand Power Stribog magazines
Does the Grand Power Stribog accept Glock magazines?
The Stribog SP9 A3G is the only model that accepts Glock magazines.'
Here are the ones that use the glock mags budsgunshop.com/search.php/q/sp9+a3g I suggest verifying this with Grand power Phone 941-549-8388
9am until 5pm EST Mon-Friday
sales@globalordnance.com

No, not all Grand Power Stribog SP9A3S 9mm firearms are designed to use Glock magazines. The original SP9A3S model, including the SP9A3S , uses a proprietary magazine, while the SP9A3G model specifically accepts Glock magazines.
Here's a more detailed explanation:
Stribog SP9A3S:
This model, and similar ones like the SP9A3 and SP9A3S, utilizes a non-reciprocating charging handle, a roller-delayed blowback system, and a proprietary magazine designed to accommodate the 30-round curved magazines.
Stribog SP9A3G:
This model is specifically designed to be compatible with Glock-style magazines. It retains the other features of the SP9A3 and SP9A3S, such as the non-reciprocating charging handle and roller-delayed blowback system.
Magazine Compatibility:
The SP9A3G model accepts Glock 9mm double-stack magazines, making it a more popular choice for users who prefer Glock magazines. The SP9A3S, however, only uses its proprietary 30-round curved magazines.

Hi Steve and welcome. I would get an accurate answer directly from Grand Power Customer Service at Phone 941-549-8388
9am until 5pm EST Mon-Friday or by online inquiry here: - grandpowerusa.com/company-information/ -------- Cheers and stay safe!