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Hi Allen, yes sir, if a rifle is rated for 5.56, you can shoot both .223 and 5.56. If it is rated for .223, then you can only shoot .223. The Ruger AR-556 can shoot both. Stay safe & have a great day!

Hi Allen and welcome. Yes Sir. This barrel is stamped 5.56NATO and will fire the lower pressure .223 ammunition no issue. Cheers, stay safe and enjoy!