5.56x45 is just a dimension, and could be used to describe any variation of 223 REM or 5.56mm NATO ammo/chambers. E.g. a barrel marked 223 REM/5.56x45 will most likely just be 223 REM.
5.56x45 is just a dimension, and could be used to describe any variation of 223 REM or 5.56mm NATO ammo/chambers. E.g. a barrel marked 223 REM/5.56x45 will most likely just be 223 REM.
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