Norinco 223 1600 rds (SFRC)

Why would you think it might not "be safe"?

I just heard that 5.56 and 223 are not exactly the same and that a rifle chambered in 223 is not necessarily compatible with 5.56...I made the mistake of Googling 223 vs 5.56 and found all matter of opinions and thought I'd better ask here.
 
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