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Hi Santos and welcome. Yes, Magazines are the same for both calibers. Cheers, stay safe and enjoy! Additional magazines here: https://www.budsgunshop.com/product_info.php/products_id/1122/magpul+pmag+m2+moe+magazine+ar-15+.223+rem+5.56+nato+30rd

Hi Santos, you can use the same magazines, but for safety reasons, I would use a dedicated .300 Blackout magazine. This way you know exactly which caliber is in which magazine and you don't put the incorrect magazine into your gun. https://300arms.com/30-rnd-300-blackout-specific-magpul-magazine.html Stay safe & have a great day!