I have a Tippmann A-5 with a double trigger, All American Barrel, and a 16oz Co2 tank.
Zapp paint is fine, as a matter of fact any paint is. This is a very unpicky barrel.
The 2 piece system and the spiral porting.
None at all.
After I bought my Tippmann A-5 I knew I wanted a new barrel, even though the stock isnt that bad. I was between the All American or the Flatline. The reson I got the All American is because since the flatline barrel is arched if you were to tilt your gun to the side the ball would curve. Also the barrel looks great and is about half the price. I bought mine for 85 bucks, while the flatline would have costed me 150 dollars. the barrel is also very light and durable and it DOSNT SCRATCH AS EASILY AS PEOPLE SAY.
Overall you are getting a great bang for your buck. It may shoot a little bit shorter than the flatline but what does it matter if you dont hit the guy.
yeah i was actualy torn between getting the flat line or an AA, i guess that the flat line is better but not its just to much freakin money, i think that the AA barrel is almost as good as the flatline and for the HUGE price difference id definatly say i am now not going to buy the flatline barrel. thanx