Freak barrels have no rifleing, in fact no marker barrels do as it's a pretty pointless concept with a paintball, a couple of barrels put spin on the ball to increase range (flatline), and then there always the apex...
I've got various tips for my freak kit from short 10" up to a whopping 18" that I haven't found a use for yet, maybe I'll run out of paint one day and use is as a club