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Hi Michael and welcome. Yes Sir it does. 300BLK and 5.56 have the same parent case, just different diameter bullets. Cheers and stay safe!

Hi Michael, yes, 300BLK will work with a 5.56 magazine. Some say it is better to have dedicated 300BLK magazines, just so you don't accidentally put the a magazine loaded with 300blk in a 5.56 rifle, or vice versa. https://www.budsgunshop.com/product_info.php/products_id/119085/ruger+ar-556+300+blackout+30rd+sr-556ar-556+30+black , Stay safe & have a great day!