Flat Line Barrels
Hey Tip-man,
I used to shoot a Flat Line with my Tippmann M-98, and it worked great until I broke a ball, and then cleaning it out was a real chore. Also, I found that shooting more than two rounds at a time increased the chances that I'd bust a ball in the barrel.
I've found that the All-American barrels from Smartparts work AWESOME with Tippmann paintball guns.