Any decent barrel with an appropriate diameter for .685 paintballs
Consistently straight shooting, good colors, great accuracy
The usual with any paint
I have been using X.O. brand paints for just about 4 months now and they are among the best paints I have ever shot. X.O. is obviously taking the time to dial in their manufacturing process and QC-ing these balls to VERY exacting standards. I've shot some of their white box paint that puts other brand premium and tournament grades to shame!.
Excellent pricing, excellent quality, excellent consistency, very very few in-gun breaks.