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William, No 5.56 Nato rounds out of this rifle. Just shoot .223. Plenty of good hard hitting, penetrating, fast expanding hunting .223 rounds out there. This barrel is marked .223 only.

William, it is not recommended since 5.56 NATO is loaded to higher pressure than .223. For warranty and safety reasons, I would get the final word from Remington directly at TEL: 1-800-243-9700

Technically, you can shoot 5.56 out of this rifle, but it is not recommended. I wouldn't do it, as you might damage to your rifle, injury or death to the use or other near by. And don't forget that it will void the warranty, as it is not covered under that circumstance. There are many bolt action rifles chambered in 5.56 that are able to shoot .223. Mossberg has some nice rifles in that setup. Check them out. It was ,my pleasure to assist you.