I know this is not an answer to the question you asked. But I highly suggest a multi piece barrel system. as from my experience, and you seem to already know, that paint barrel match greatly effects the precision of the marker. so a barrel kit will allow you to any paint much more accurately than a single piece barrel. I know they can be expensive so save and wait .
If you are dead set on lightness, I have used a Deadlywind fibur barrel, it is light fairly quite and very nice.
Thanks for the suggestion. I have no problem with the cost of a barrel kit, but the field I play at will only allow field paint, so there isn't really a need for me to get one since the paint bore will always be relatively the same. I might end up getting one though because the climate where I live(Washington) flucuates a lot with humidity, rain and heat in the summer. So I might end up buying a used barrel kit from someone with only the inserts I need. But until I find one I'll just stick with the stock barrel, it isn't that bad.