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Jose, I am almost certain that the barrel is stamped .223 but I would confirm this directly with Sauer & Sohn Customer Service at 1 (210) 377-2527. Cheers and stay safe!

no it is 223 only the 556 is a typo on buds part Correction request sent

This is chambered for 223, not for 5.56. so don't try to shoot 5.56 out of this. Buds has a habit of writing 5.56 on every 223. Sorry but hope this helps.