SpudFiles

How would I connect a blow gun to a brakeline or any other type of 6mm airsoft barrel?

I have not gone shopping yet, so about how much is brake line or copper pipe?

like this:
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At NAPA Auto parts, it's about 2.50-3.00$ for a 20" piece. As for connecting them, the brakeline comes with a male compression fitting. Just find a female compression fitting of the same size. After you do that, just adapt the female compression fitting to a 1/8" NPT thread. This will just screw in the outlet port of the blow gun. If you want to take the easy but crappy way out, just JB Weld the barrel to the blowgun.

I say take the crappy way out. Or if you have the right taps and dies you could whip something up.

I made something very similar except I used a real airsoft barrel. What I did was wrap about a cm of Teflon tape around the barrel. Then I just threaded the wraped part into the smaller threaded part of the blowgun.