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Hi Chris, it should, Glock 17/19 mags reportedly work as the DY9 is a Glock near-copy. Stay safe & have a great day!

Hi Chris and welcome. Glock 17 magazines are required and compatible for the DY9: https://www.budsgunshop.com/product_info.php/products_id/10581/magpul+pmag+for+glock+17+17rd+black ---------- Cheers, stay safe and enjoy!