.223/5.56 Mag for 300 Blackout?

[SteveCNJ]

I put a 300 blackout upper on my AR15 lower. Are the .223/5.56 mags 100% feeding rounds using them for 300 blackout?

Thanks,
Steve

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[Dylabeatus]

I hesitate to say 100%, but anecdotally, I have shot all of my .300BLK with 5.56/.223 mags and have not had issues. Rough estimate would be 1k rounds with it.