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Doesn't look like a bad barrel, but I personally don't have any experience within them. Curious as to how they cut the land n grooves. Based on price I'm going to go with button rifling.
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Button rifling is not necessarily an indication of accuracy concerns. Many precision, custom barrel makers of national competition level use pull button rifling. It's the care and attention, the quality of the equipment, the skill of the barrel maker and tiny details in the process that make a difference.
My almost $500 Lilja M4 barrel is custom made to match specs, shoots .5 MOA or better, if I don't screw it up, and is pull button rifled and hand lapped. Lilja's concentricity (straightness of the bore and the rifling is within .0002" of absolutely straight across the entire length of the barrel.
Yes, the barrel in question is probably button rifled, but that does not answer the question about accuracy. There are way too many other variables involved. Rifling method (hammer forged, versus button rilfed versus single point cut, for instance) is really not one of them.
I don't have any experience with BA barrels, either. It may shoot well or not. But, I'd not criticize it just on the basis of button rifling.