barrel question for the hoarde?

[tackdriver]

I think what I an looking at is throwing me off because I just built a 18" for my dad and his barrel had m4 feed ramps. I see this barrel does have feed ramps but not as robust as the barrel we installed a couple weeks ago.

B.Waited, the barrel is stamped 6.5 grendel but does not indicate twist. Do you know if that follows AA's mo?