Barrels are a strange thing, I've had $100.00 Mod1 barrels shoot just as well as some of my 500.00 Noveske's and Black Hole Weaponry Polygonal barrels flat shoot!
This was from a 16" Mod1 sales 5.56, 9 twist barrel I purchased off the forum used years ago. Ran me $70.00 bucks shipped. These are some groups from doing load development at 200 yards.