For normal paint and for general use the stock barrel is good.
If however you feel the need to increase your accuracy by promoting grouping of paint, then a barrel system that allows close paint to bore matching will help.
I tried the dye ul range and couldnt get on with it, so I went back to a freak system which I have a lot of confidence in. It works for me, and so I'm happy. Something else might be your preference.
Try what you got first, and if you aint happy, have a look around.