I don't have a carbon, but a 14.5" SIG 516
It shot 10 round 5" group at 200m with factory PMC M855 type ammo, no sandbag or anything.
No, I don't think it will be 1 MOA rifle, unless you feed it a particular type of match ammo that it likes. 99.99% of the run of the mill non-match AR15 are not 1 MOA performer.