Which ar15 barrel?

[TCman]

I am building a 18 inch SPR ar15. I originally was going to use a Noveske barrel, but a rainier barrel is almost 100 dollars cheaper. Which one will be more accurate? The Noveske is 1:7 polygonal rifling, and the rainier is 1:8 rachet rifling which I am not familier with. I am also planning on using a Young NM bolt carrier group and Voltor upper.

 

[Jimro]

Either one will be fine if you are happy with MOA groups, if you are on the quest for "one ragged hole" I wouldn't be building an AR. Tune your load for the barrel. I have a fondness for polygonal rifling as I believe that at some point the less deformity on the bullet as it passes through the bore translates into tighter groups, all else being equal.

Jimro