Dumb AR question 5.56 to 300BO

[alnen]

Not all 556 mags work well with 300bo. Do homework on the mags you plan to use. Then try them out

 

[shootin4fun]

I have a 8.5" 300 BO Pistol that takes Pmags very well. I have my mags marked with rubber bracelets that people wear except they actually read "AAC 300 BO" on them and they are non windowed black mags. They are kept separate from my other mags. It's a great round. A little more pricey than 556 of course. Good luck.

 

[Rickye]

Thanks everyone for all the feedback, glad I asked, clarified some really good points.