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Hi Brock and welcome. No, as it is the single stack magazine model. There is a 9rd extended magazine with sleeve here: https://www.budsgunshop.com/product_info.php/products_id/18210/promag+s%26w+shield+40sw+9rd+bl+steel

Hi Brock, no sir, this uses single stack magazines. The best you can do is 9rds https://www.budsgunshop.com/product_info.php/products_id/18210/promag+s%26w+shield+40sw+9rd+bl+steel , Stay safe & have a great day!

Buds has a 12rd extended mag that will supposedly work, look under the compatible items tab on the description page and select magazines, you will see what I'm talking about. Hope this helps!