Only stock barrels. They all are squirt guns compared to this.
Tippmann Triumph with J&J Full Tilt Ceramic 16in
XO or any at .688
Chips paint off fount easily
I bought the Tippmann Triumph for $40 as my first gun. After using it several times I decided I should upgrade the barrel (comes with expansion chamber and 98 custom insides already) I looked around to find the best barrel I could. I first considered the flat line but after hearing some bad reviews on it I strayed away. Then I heard of the Full Tilt Ceramic. I looked at several different sources for reviews and all around people found the barrel to be awesome. I went and found it on Amazon.com for $55 and $30 shipping (shipping kills even if it is just to Canada) Anyway I bought it and after a week of waiting received it. I was pleased to see they included a oring for it. A few days latter went out to a local indoor arena and tested it out. Took a few shots to find where it was going but even with the pressure at 230fps I was still constantly hitting a target 50ft from me with about 2in spread. Needless to say I was impressed. I got to playing a few rounds and the barrel wasn't letting me down. I was hitting people left and right in 3 shot burst (first shot tell me where the ball is going and the next to allow me to tag them(semi auto)) I was very impressed. Even when my pressure had dropped to shooting the ball at 150 I was still able to tag people across the arena. (took a bit of a lob) All in all I say this is the best passable upgrade I could of got for my gun.
If you are looking for a barrel and dont mind spending a little money then go for it. They come in a wide range of sizes and work great.