Originally Posted by GaryR1984
iFit kits are not great, the barrel tip does not add to performance and can potentially hurt it.
The ultralight is great, if anything you would want a smaller bore. A smaller bore will slightly increase efficiency. You should spend some time reading some data from test done by people educated on the matter in the barrel forums. You will be surprised at the amount of knowledge that is on this board if you are just willing to shift through on the nonsense some idiots spew.
Ideally, you would make up your own mind on what you want. There are a pro and cons to bore matching/underboring/overboring.
You just want a proper fit. Stock UL are like .688. Paintballs today are a lot smaller on average than they were before when .688 was the norm. This is where freak inserts or a barrel kit shine. Getting a different tip is pretty useless the dye tip is arguably the best barrel tip ever made next to anything smart parts (hence why they both dominated the market for well over a decade).
You want a bore fit where you can drop a paintball into the barrel and it gets slightly stuck and wont fall right out. Then you blow through the barrel and with minimal effort the ball comes out. That is how you gauge a proper fit.
protip: before you play, buy your paint first and open all of the bags. Let the paint swell/shrink depending on weather. Walk the fields, shoot the **** with your friends etc and come back to your paint later on. Then you do the bore test. You don't want to do the bore test and chrono the second you buy your paint that has been held indoors in a cool room. You want to do the test after the paint has been exposed to the weather of the day.