Krieger and Bartlein (proof research also) are both cut rifled barrels, vs most other brands being button rifled.
Cut rifled barrels are generally regard the best you can buy, Bartlein in particular has made a name for themselves.
In many cases you aren't going to notice a difference, and the extra cost of a Bartlein or Kreiger likely isn't worth it over a TrueFlite.
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