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That would make sense, It could be a similar situation to shotguns where you can use a 3" magnum in a shotgun chambered for 3.5" but you cannot do the other way around. But I would have thought they...

That would work if it was marked 5.56 (223) but it chambered in .223 and also takes the 5.56x45. If I am reading that properly that is the other way around.

That does somewhat make sense. I see where its coming from now. There still seems to be some debate as to what is safe and what is not but it makes more sense than some of the earlier explanations....

because we all know the internet is never wrong......

When I see rifles by legitimate manufacturers stamp their rifles as both calibres are you telling me that they dont know what they are doing?...

I was under the impression that 556x45 was 223. Just like 7.62x51 is also 308 and 7.62x63 is 30/06. The metric designations are used mainly as some country's actively ban imperial measurements. I...