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These are loaded to .223 SAAMI Specification, and can be shot in a 5.56 or 223 Chamber with no issue.

Scott, yes these can safely be shot in your .223 AR rifle. These are .223 and can be used in either .223 or 5.56. And you are correct, you should not use 5.56 ammo in a .223 gun.

Scott, I would check what's actually stamped on your AR's barrel or check with the manufacturer as most loaded ammunition with annealed cases are loaded to 5.56 pressure. Cheers and stay safe!

YES, These are .223 and is safe to be fire from both 5.56 and .223 rifle. I hope this helps!