Good job! I'm surprised you chose to build a whole backpack rig for your first gun. I'm in the process of building my first BBMG myself.

I added Revision Two, basically a blowgun fix and the question mark about the barrel. So shortening the chamber should enhance the performance? I'll just set back the vortex block a tad and let the barrel come in and rest in it and then epoxy it.

^ Wow.

Very nice range, nice gun. Next time give it a paint job though.

Did I draw the blowgun upside down?

What do I use to connect the barrel to the end cap though?

... Click on it? I can and it gets bigger. If it doesn't, here you go.

Below is my design for an inline vortex. Tell me what you think.

UPDATES
12.22.07: Added Revision One as attachment; added Revision Two

Solely for style. lol I'll go with the brakeline.

I'm planning on finally building my BBMG, inline vortex style. However, since I have no idea what sizes copper pipe runs in, I'm a little stuck. Instead of 9/32 brakeline, I want to use 9/32 copper pipe. Do they make that?

http://www.phreakyourgeek.com/plans/bas ... -beginner/

Basic, simple plans for a basic, simple combustion gun.

Back to my original question. What can I do with it?

Would KY Jelly work as well?

I have a total of 8 1/2 feet split into two lengths of 4 feet and 4 1/2 feet,

I have a length of 3" pipe laying around, and I was wondering what I could make with it... I was thinking of getting some 6" and making a huge pneumatic...

Or a golf ball cannon, with it and the chamber. What do you think?

Oh no, leave it all.