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I have both 223 and 5.56 rounds on hand, pic related. My AR's lower says .223 caliber, but it has a 5.56 NATO barrel on it. I assume due to the barrel it's safe to shoot the 5.56, but what about the 223?

Before thinking about it much I've shot both through it, and nothing went wrong. Well, yet. After thinking about it I'd rather get some second opinions before chancing it again.

Internet literature and video research turned up inconclusive results, at least from what I found.

I have both 223 and 5.56 rounds on hand, pic related. My AR's lower says .223 caliber, but it has a 5.56 NATO barrel on it. I assume due to the barrel it's safe to shoot the 5.56, but what about the 223? Before thinking about it much I've shot both through it, and nothing went wrong. Well, yet. After thinking about it I'd rather get some second opinions before chancing it again. Internet literature and video research turned up inconclusive results, at least from what I found.

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You're almost certainly correc. I don't think I've ever seen an AR lower marked .223, maybe its really old or some chinese shit. If it's marked .223, I'd assume there was a reason. Maybe the manufacturer is a dumbass and that's the reason. Do you really want to be using a gun part manufactured by a dumbass in a way they didn't intend?