I have found on poopy weather days the stock barrel is better than my silly priced barrels for my 08. However i have the python "bore" kit (mini freak kit if you will) where i pick the right size insert for the paint being used and screw the stock barrel into that. for some reason this works pretty well. However, the shaft 4 on my 11, as Mr sanchez says, its pretty dam good for a "stock" barrel.
ooo and to add. have a mate i ball with (not in a gay way) and he uses the python kit and stock barrel on his ego 8. he says he's never needed to try other barrels as its pretty dam accurate as it is.