what the best barrel length?

1-      BARREL LENGTH- For the most part, the length of your barrel does not affect accuracy. A paintball needs about 7.5-8 inches of barrel to stabilize, and to be truthful, after that, you are using more of your air source (co2, n2, or HPA). So, the longer the barrel, the A- more air you use and B- the more you have to turn up your velocity. This should help to eliminate questions asking “How long should I order my barrel?”
Accuracy

Accuracy depends on several things, and length of the barrel doesn’t effect accuracy. Here are some things that effect accuracy

·        Good, fresh, non deformed paint

·        Paintballs without paint spill on them

·        Clean paintballs

·        Velocity not too high-280 FPS is good

·        Clean barrel

·        No spurs in barrel

·        Good Paint To Barrel Bore match