The pic is fairly self explanatory, the barrel is approx 7.5mm ID, and fits nicely in the blowgun, some of the barrel is sleeved with 20mm pipe, heated up to slide over the outside of the blowgun. I Run this gun at around 90-120PSI.
The Barrel basically slides in and out of the blow gun for easy re-loading and it slides in 25mm cut off's attached to the chamber, need to glue them in place, but they are just taped for now.
Any Feedback, or constructive criticism is welcome, and also i know blowguns are not the best valves, and don't have very much flow, but still this gun has a lot of power.
Also give credit to Mr.Russ as he made his first and i just made my own version of his.

Just quickly made a bipod to for it, taped it together because I'm out of hot glue at the moment, but thought i would add these pics too. It comes of easy to, when its glued properly it can swivel, turn, tilt and can be detached quickly without have to slide it of.
Vids coming soon, one of me shooting an egg too

Heres a vid of me shooting an egg: