The most accurate barrels in the world are between 6.05mm and 6.10mm
I can't say I agree with you there.
PDI's own literature refers their 6.01mm to be maximum velocity and their 6.08mm barrels as their maximum accuracy barrel.
"High quality inner barrel.Its inner diameter is 6.08mm
This is new concep. Made of Stainless steel. It's not so tight,
This barrel keeps libration after trigger release low, and it rise up accuracy.
...
Actually,we are not sure to say 6.04mm is the best barrel.
Because it's depend on each setting.For example,if you want better
FPS,we recommend 6.01.If you want better accuracy,you may choice
6.08mm.
In our opinion,
In case of smaller Dia.,youfll get more speed.
On the other hand,in case of larger Dia.,youfll get abetter accuracy.
Smalller Dia. has strong pressure for BB.An Airflow makes BB stable.
Thanks
PDI Co.,Ltd.
Sales Manager
Tomohiko Nishizono"
I have volumes of data to back it up from various credible sources, and from my own experimentation.