Posted 30 January 2013 - 11:37 AM
Generally, I think of these factors in deciding whether a barrel is good:
1) Is the barrel 14-16 inches long? It needs to be in this range to help maximize the exit velocity of the paintball prior to leaving the barrel. Any shorter and you lose acceleration. Any longer and you increase drag.
2) Does the barrel have an unported control bore of 8-10", preferrably closer to 10"? This also helps with velocity and consistency. For a 14-16" barrel with a 10" control bore, this will give you 4+ inches of ported length to modify the sound signature. I've heard that having a ported section helps slightly with consistency, but haven't tested or seen the data to confirm it.
3) Will the barrel be a slight underbore for my paint? Most of the paint in my area spans between .682 and .686 or so, then gets larger in the hottest months of the summer. Since paint-to-barrel bore match makes a marker slightly less consistent, I want to have either an underbore or overbore for consistency (with an underbore also improving velocity/efficiency). An underbore of .003-.005 is ideal with a max of about .008, so I'd want a barrel in the range of .677 to .683 depending on which field I'm playing on.
The other factors I might consider would be internal finish and exterior color, but most modern barrels have equivalent finish properties and color is not a performance-driven consideration.
Happiness... is a warm mechanical marker
Mechanical Marker Fan: Azodin Kaos-D / Tippmann Crossover