To the OP: it sounds to me like you are chasing accuracy of the platform by trying to add up all the features that you read are 'best'.
Honestly a tight group is much more about finding that magic combination of bullet that your barrel likes. YOUR barrel. Barrels from the exact same batch (same specs) may like different loads. The best example of this besides dragging a ton of guns out and shooting all the bullets through them, would be to watch Molon's precision threads he does on barrels. Consistently through his posts: a barrel with 'poor' specs (CL/4150) can shoot INCREDIBLY good. Infact if I was really really bent on getting the 'best barrel' I would get a Colt. Thats based just on Molon's documentation.
In reality I just bought a faxon match. I bought the barrel more for the profile and length (14.5 gunner) than I did for the nitride, stainless Steel, or even the 5r rifling. I simply choose the match over the regular barrel because I have a real stash of 77gr ammo and do like shooting my carbine as far as the desert will let me. Honestly though I doubt as a shooter I would put either barrel passed its mechanical accuracy.
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