I like this barrel a lot, it is durable, accurate, and quiet. It comes in the lengths of 10", 12", 14", and 16", all in the bore of .689. This barrel works real well with medium size paint. Please post your comments on this barrel too.
I have a '99 Autococker STO and it comes stock with a two-piece J&J barrel. It performs great for me. I usually shoot 32 Degrees Team Colors paintballs and I haven't really had any ball breakage. All I can say is that it is an excellent barrel and it performs awesome.
I have one too, and it has shot well for me. The fit of the screw-in tip on mine was really nice. I currently don't shoot it much because the Tear-Drop is the flavor of the month now. I picked up some of the extensions at Skyball last year for $10 each. What a bargain!
One thing, check the anodized tip very well I looked at several at Skyball and where they had hooked-up the connector for the anodizing was very rough and could have broken balls. It was right on the end of the barrel.