Jeev
Unfortunatly not every paintball is the same size
It differs from manufacturer and batch. Even then not every ball is the same size, hence bore sizes.
a well matched ball to barrel will shoot very nicely, however if this match isn't as perfect as it could be, welcome to smeg city
The freak works using interchangable bore inserts (i'll show you when we meet up) However the freak is the only barrel on the market to do this. All the other barrels have been cut to a certain size.
I'd say the Boomstick is an average size bore and genrally should be sound
The Armson is in the larger end of the scale, for those big bore paintballs
I won't lie to you, the stock barrel isn't great, and is quite a small tight bore. You should only use it in the worst cases.
If you have any questions/concerns don't hesitate to ask me. I'll do my best to help you out
Simon