Re: Quality 16" AR barrel
You're going to be getting close to 1MOA from most decent factory barrels (ie rock river, etc) with match ammo anyway. Unless you get a bad one, which happens.
With the 55 gr milspec stuff it's sort of hit or miss, what ammo does the barrel like, how tight is the chamber, more a manufacturing tolerance difference than anything else.
The higher end barrels are going to run better with match ammo, fo shizzle, but will they group crappy budget ammo any better? Tough to say.
3MOA with any barrel and you've got a with your barrel, or your ammo, or maybe your barrel just hates your ammo. Or you've got a shit trigger on your gun and your scope mounts or scope sucks or you're not quite adept at shooting irons well.
But there's tons of differences just between individual barrels. Way less so with the high end ones. But for example I've got an ancient Bushy barrel that is right around 1MOA (at 100 yards) with PMC 55 grain ammo, it's got 15K rounds through it, keep on expecting it to start sucking, but it's still solid.
