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Jose, the G3c can use Sig P226 Magazines of different capacity. It can also use Taurus G3 Magazines. https://www.budsgunshop.com/product_info.php/products_id/54266/mec-gar+mgp22618+sig+p226+magazine+18rd+9mm+anti-friction ------------------ https://www.budsgunshop.com/product_info.php/products_id/714022199/mec-gar+mag+sig+p226+9mm+20rd+dps

I'd either stick with factory one's made by Taurus or mecgars a pretty reliable brand. Promags are tempting because they are usually inexpensive but have reliability issues. You can also use sig p226 magazines in the g3c. Hope this helps.