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Hi Rene, yes, the same BCG is used with both calibers, and they use the same magazines. Stay safe & have a great day!

Hi Rene and welcome. Yes, the 300BLK is just a 5.56 case necked up to 30 caliber and both use the same BCG (Visual comparison here): - https://www.ammoland.com/2024/07/300-blackout-vs-556-nato/ ------------ Cheers, stay safe and enjoy!