This question may be old, but all the answers I have seen on YouTube say you can put a .223 in a barrel marked for 5.56, but not the other way around.

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James G. · Answer

Vincent, This is correct. This rifle has a barrel that is stamped 5.56NATO so it will handle the 5.56 and lower pressure .223 round no issue.

William P. · Answer

the difference in .223 and 5.56 is the thickness of the brass and pressure.  You can shoot .223 in a 5.56 barrel with no problem.  I would not shoot 5.56 in a .223 barrel unless it is a .223 Wylie barrel.

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This question may be old, but all the answers I have seen on YouTube say you can put a .223 in a barrel marked for 5.56, but not the other way around.