The quest for accuracy...
Rifled!? Please. Consider the true definition of barrel rifling - a series of spiral grooves cut inside the length of a barrel, designed to spin a bullet around its horizontal axis in order to improverange and accuracy.
Bullets, yes. Round paintballs, no!
How do you make a baseball curve? You put spin on it by rotating your wrist.
SPIN! You put spin on it.
Why would you want a rifled barrel on a paintball gun?
Why do barrel manufacturers advertise rifled barrels?*
In most cases what the barrel makers call "rifling" is actually spiraled holes drilled down the side that, fortunately do not add spin to the paintball. In the case of the "Tru-flight" barrel that has actual rifling in the barrel the rifling is straight. "Hammerhead" barrels are spiral rifled. Fortunately that rifling is so light and fake that it has no spinning effect on the paintball.
Paintball markers are not rifles. They are toys** we use to play a game called paintball. Paintball markers are inaccurate. There is nothing a barrel can do to a paintball to add any measurable accuracy. The reason tournament players shoot 25+ balls per second is to make up for the inaccuracy. One case - one kill!
Truth.
*to make you think the barrel is more accurate and worth the outrageous sale price.
**even though most of them have the evil warning stamped on the side "This is not a toy!"