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Hi Don and welcome. This uses Diamondback DBX 20rd FN Pro Magazines. https://www.budsgunshop.com/product_info.php/products_id/129718/diamondback+dbx57magfn+dbx57+5.7x28mm+diamondback+dbx+magazine+20rd+black+detachable - Cheers, stay safe and enjoy!

Hi Don, this uses common 20 and 30-round FN Five-seveN pattern magazines. It can also accept 55-round drums. 30rd https://www.budsgunshop.com/product_info.php/products_id/77665/promag+fnh-a2+fn+fiveseven+usg+magazine+30rd+5.7x28mm+black+polymer , . 20rd mag here >>> https://gunmagwarehouse.com/fn-five-sevenr-5-7x28mm-20-round-factory-magazine.html . 55rd drum here >>> https://promagindustries.com/fn-five-seven-usg-5-7x28mm-55-rd-black-polymer-drum/ . Stay safe & have a great day!