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The reviewer has an odd interpretation of semantics. These are stamped 5.56x45 which is the same as 5.56 NATO and also uses .223 Remington.

Hi Ernesto and welcome. It is chambered in 5.56NATO and can also fire .223. No idea what the poster is referencing. Cheers and stay safe!

Hi Ernesto, 5.56 and 5.56 NATO are one and the same. The person who posted this is not well informed. Stay safe & have a great day!