Doesn't really matter have tried Evil, Diablo, Draxxus, Monsoon.
Not as accurate as claimed by company
Bought the full barrel kit in hopes of improving the accuracy of my X7. I had a J&J ceramic barrel and liked it, but wanted more from my marker. I spent well over a month reading various reviews from magazines to users. I finally broke down and bought it. I found the barrel to be well built, but nothing to get go head over heals about. Side by side with my J&J there was a minimal increase in accuracy. Nothing worth 200.00 dollars for. This barrel will not have you shooting ropes down range. I'm not saying it's not an improvement, just no where near worth the price.
Save your money. Your not going to get the value out of this that you will expect. My friend bought a barrel from Rap4, that has similar rifled groves, for about 34 bucks and side by side he shoots just as straight as I do. This barrel will not turn your marker into a tournament accurate marker. I'm going to put mine on e-bay very soon.