Sorry hyperlite, I honestly thought you were just coming on and making a sarcastic comment, must have read it the wrong way or something. Sorry man, no hard feelings I hope
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It depends on what makes you feel comfortable. I personally prefer a little bit of weight, but my mate shoots a marker setup, that no kidding, weighs just over a kilo and a half WITH paint, if I remember right.
The problem with a carbon fiber barrel is that it can sometimes make the marker tank-heavy depending on your marker. The best is to try someone else's kit first.
As for accuracy, most high-end barrels perform the same, it's more the marker, i.e. a spool valve will be much more stable, a blowback will be much worse. Boring can help alot but is tough to do since paint bore can change many times in a day due to weather and humidity. Usually I just stick on a .691 and that serves me fine.
Again, apologies, dude.