Tippmann custom 98 using co2 (9 oz late in the day and 20 oz early in the day)
Marballizer's, Super Swirl & Dusk are what I have used used
Accurate, Quieter than stock barrel, CHEAP (in price not quality)
Velocity settings are very important
3 of these barrels were purchased at the same time for Tippmann custom 98's. 1 for me (blue), 1 for my son (green), and my father-in-law purchased 1 (silver). All were supposed to be 14" but, the silver barrel was slightly different in appearance (shorter & different thread adapter). When my son put the green one on his gun it shot perfect, at 100' he was hitting a telephone pole 20 out of 20 (super swirls). I put mine on my gun and could only hit the same pole about 10 out of 20 (marbalizers) with 5 of the ones missing by about 8 inches or less and the remaining 5 going all over the place. When my father-in-law put his on they were all over the place (marbalizers), he might have hit the pole once. First thing we tried was changing to the super swirl paintballs, but that did not make any difference. So we started switching barrels as soon as I put my blue barrel on my son's gun I got the same results as he did 20 out of 20. So we started playing with velocity. I ended up turning my gun down and putting my blue barrel back on my gun. And after some tweaking to the velocity It started shooting everybit as good as my son's setup. So we moved on to my father-in-law's gun and barrel (silver). After alot of tweaking we ended up getting it better but not nearly as good as ours. At 100' he is probably hitting the pole 10 out of 20 with 6 getting within 8 inches and 4 going all over the place. I still plan on doing further testing but this has been a pretty cold winter here in Ohio and I can't get out as much as we would like. I also would like to say that I have used the Dusk paintballs in this barrel and achieved equal results to the marballizers and super swirls.
I do believe that for the price this a great barrel and would serve the recreational player very well.