We ARE on the internet, so if that's your approach, why would you take anyones advice for/against .223/5.56x45 compatibility on this forum over the many articles google can find?
Wikipedia isn't a perfect source either, but is a good starting point, as it is meant to have footnotes, citing the original sources of the information. Keep reading until you are satisfied you have found your answer. Or don't - just have a go and let us know how you get on.
https://en.wikipedia.org/wiki/.223_R...C3.9745mm_NATO
Short answer is that it (safety) depends on the chamber of any particular rifle.
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