I don't do suppressed or SBR.I am most likely not going to worry about suppression. My main reason for going Blackout is stopping power. So most likely a supersonic match hollow point.
So I just put some $ in the account and realized I could buy a new URX III 13.5 KAC rail for my 5.56 16" and switch the Ati rail to what will be 14.5" Blackout. I think the URXIII is so cool looking but is it really worth the $300. Can any one tell me why?