So went to a local gunsmith today to have him headspace my new savage build (Criterion barrel, varmint, .308 from Northland). Being pretty new I'm learning a lot during this build. He asked me if the barrel was finished, which I thought they were. He then went to talk about if it was +5 barrel he would need to ream it etc. Got a little bit lost as English wasn't his first language.

So my question is are Criterion barrels finished? or do they need to be reamed?