[Reno89519]

I specifically bought a 5.56 to avoid the potential issues of buying .223 and using both ammo. So far I have strictly used 5.56 ammo in my Armalite Eagle-15.

[Cobra64]

Me too.

[MtnClimber]

I specifically bought a 5.56 to avoid the potential issues of buying .223 and using both ammo. So far I have strictly used 5.56 ammo in my Armalite Eagle-15. From what I have read the .223 would produce lower pressures and no reloading problems. Seems you could shoot .223 with no problems.