BudsGunShop.com - .223 and 5.56
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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.
2 Answers
Smith & Wesson M&P15 Sport II 223 Remington/5.56 NATO AR15 Semi Auto Rifle
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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.