Well, thanks to Jeremy I build not one but two blowguns today. The pvc one is 80cm long with a 18mm bore. The bamboo blowgun is 118cm long (without the muzzle protector). They are both very functional and a whole lot of fun to shoot. I am especially proud of the bamboo one while the pvc one is rather ugly. The darts are from a coathanger with a paper/tape cone or cotton fabric and string. Hope you like it.