Many AR's and ammo combinations are not capable of sub MOA accuracy. A colt 6920 with m855 is maybe a 2 to 3 MOA rifle. A BCM with m855 would be similar depending on the rifle and the ammo lot. Match ammo through a standard AR barrel is maybe 1.5 MOA with a magnified optic, give or take depending on the barrel itself. Many stainless match barrels are capable of just under 1 MOA with match ammo.
LaRue, Noveske stainless, BCM stainless, and similar, are 1 MOA rifles with match ammo. This could be 55gr to 77gr, depending on what the rifle likes. Even these rifles are not sub MOA with all ammo.
So, I would say you're doing fine. If you really want to know what you and the rifle are capable of, try 10 shot groups, 5 at the lowest. This takes luck out of it. I've had sub MOA 3 shot groups with my BCM. I've never had sub MOA 10 shot groups with the same rifle. 10 shot groups give me a better idea of what I can do with the rifle, not what might happen, if that makes sense.
So, a precision AR with match ammo, 1 MOA is solid, maybe a little under. A standard AR with match ammo, maybe 1.5 MOA, give or take. An Accuracy International AX308 with match ammo and a Scmidt & Bender 4-16, sub MOA would be expected with a solid shooter behind the rifle. I don't expect that out of my AR, regardless of the barrel.