anything form .688 to .692
RP premium and swirl work epecially well, cheap field paint is suprisingly accurate also
-looks, mirror-like interirior, great design
-loudness, my 10 inch is much louder than my brothers j&j ceramic
This barrel is very impressive. When I first took it out of the package I thought it was way too light for a barrel. It had a nice silk bag thing and it looks great, inside and outside. It was very shiny with a nice blue anodized (I think) finish. It also has a true .689 bore, unlike my lapco bigshot. My RP Premiums and 32 degrees actually passed the blow test! (Most paintballs roll straight through my lapco bigsot resulting in poor accuracy) . Accuracy on this baby is amazing. From 50-60 feet pballs land on on top of another. NO lie, no regulator, no xchamber, just a m98 and this highly accurate barrel. Even cheap field paint that is clearly too small land within 2 inches from 60 feet!
From farther out at 110 feet the accuracy decreases but is still very good. The diameter is about 6 inches for an average grouping at 100 to 120 feet.
This is clearly superior to my lapco bigshot in accuracy, noise level, and length. It also surpasses the accuracy of my brothes jj ceramic on all counts except for noise. Highly reccomended.