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Jacob, it chambered in 5.56 which will shoot both calibers. If it says 5.56 NATO, the firearm can shoot both 5.56 and .223. If if only says .223, it only shoots .223.

Hi Jacob and welcome. For safety and warranty reasons, please contact Christensen Arms Customer Service for the actual barrel stamping (.223 and/or 5.56) at 1-888-517-8855 Monday to Friday - 9:00 am to 5:00 pm Central Time. Cheers and stay safe!