This barrel came stock on my STO autococker. I thought it was okay at first cause i was using proball platinum and every ball was right on the other. It looks very sweet and is very quiet for a 12".
This barrel is very picky on paint. I was using proballs and it was shooting fine untill i broke a ball. that was horrible! every shot was winding out so bad. when you break paint, it gets in the portings and really screw your trajectory up bad!
Another thing is that its very heavy. I weighs so much more than my 16" Smart Parts All American. That can get agrivating on the Field. Paint that i would stick with in this barrel would be probably be Marballizers or All Stars, Team Colors shot okay but didnt break very easily. Another cheap and good paintball that shot nice was TASO powerball. I was going far and straight and broke on its target.
This barrel is okay if your just adding to a collection but i would consider a CP one-piece or an All American. Thoughs are the only two i've tried and they are both better than my J&J. Good Luck!