Is there a difference in how each manufactures? Just curious.
Yes there is cut rifled and there is button pull or pushed. Also some have different grades of barrels where others only have low or match grade.
Also polygonal rifling. Not as common but can be very good. David Tubb used to run Schneider poly rifled barrels.
Used an 18" polygonal Pac Nor on my first build. Was back when John Noveske was their in house smith. Was by far my most accurate and would shoot 1/4 to 1/2 moa. Since then, I have purchased 2 other Noveske polygonal tubes...one a 7.5" and then another in 10.5" in 6.8. I know they are expensive, but they shoot lights out.
Also have polygonal on my HK.