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Most Radical Firearms AR-15 rifles (specifically the RF-15 models) are chambered in 5.56 NATO. Because they are chambered in 5.56 NATO, they are designed to safely and reliably fire both 5.56 NATO and .223 Remington ammunition. I don't know which one you're looking at specifically , but if you can enlarge the picture , it should say on the receiver.

Hi Richard, Radical Firearms AR-15 rifles are chambered in 5.56 NATO, which means they will safely fire both 5.56 and .223 Stay safe & have a great day!