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They sure do! https://www.budsgunshop.com/product_info.php/products_id/77665/promag+fn+fiveseven+usg+magazine+30rd+5.7x28mm+black+polymer

Hi Bruce and welcome. Yes Sir, 30rd magazine and 55rd drum here: https://www.budsgunshop.com/product_info.php/products_id/77665/promag+fn+fiveseven+usg+magazine+30rd+5.7x28mm+black+polymer ------------------------------ https://www.budsgunshop.com/product_info.php/products_id/713095908/promag+magazine+5.7x28mm+55+round+drum+fits+fn+five+seven+iomusg+pistol ------------------- Cheers, stay safe and enjoy!