Thank you guys

I'm not originally from America so this helped a bunch

I'm going to make a barrel sealing piston gun, and I'm going to use the blow gun as an exhaust valve. I don't care much if its expensive, just as long as it is good quality :)

MajorCollins:
I don't understand this sentence "though my find some are one piece full brass which are excellent"

Sorry ...

I'm just here to ask you guys about a air blow gun... I need a relatively small one and i think this one (http://www.jhmbuttco.com/acatalog/info_SA913.html) looks good. But i read somewhere on this forum that this blow gun looks similar on the outside, but the internals are different from different ...