I built a 6 ARC AR and really like it, but as mentioned Ammo and brass has been limited. Yeah, I can neck down 6.5 Grendel, but that was limited for a while as well. I think one of the issues besides ammo availability was barrel quality. I have the Brownells/Faxson barrel and had good luck with it. I know a couple of others locally that bought the same barrels and had horrible experience with them as QC seemed to be off.
Now that other barrel manufacturers are making the barrels and ammo is becoming more available, maybe it will catch on more.
Now that other barrel manufacturers are making the barrels and ammo is becoming more available, maybe it will catch on more.