4.53 moa with Hornady eld v match 80 grn. 1.18 moa with hornady black 0.959 moa with hornady match.
If you considering that "amazing accuracy", then you may want to reconsider your standards for accuracy.
There are plenty of reinforced upper recievers (VLTOR comes to mind) out there, and plenty higher quality barrels as well. Geissele may have figured out a higher quality magazine, but they certainly didnt reinvent the wheel on 6 arc by any means.