Ok ran into this commercial. Yes I know it's old but it talks about how the smooth twist barrels are revolutionary compare to other barrels cause it doesn't have rifling all the way. It's smooth so the pellets glides like a hot knife in butter. Giving maximum speed, Reducing fraction and increase BC. Then the last 4 inches or so it hits the rifling giving it the correct twist for each caliber. It reduced wind speed and boost accuracy on each shot. It is the most accurate barrels.....made me think, so why are fx liners/barrels rifle all the way now if this commercial says the smooth twist was the superior barrel. Should we go back to smooth bore with rifling only at the last 4 inches??? Hmmmm