I recommend thinking about what you just asked. You are messing with 800 psi. and your having trouble with pipe fittings? You might reconsider your whole approach.
I haven't had any trouble so far, I'm just wondering why many fittings have hex centers while pipes don't. :(

First, to answer your ...

Suppose I have a steel pipe nipple with hex fittings on each end:
http://i.imgur.com/2WjCNaz.png

I can tighten this section easily by screwing the hex fittings inwards towards each other. However, it seems I can't disassemble the section without a pipe wrench. I'm working with unregulated CO2 ...

I like this idea. Here are some important considerations:

1) I have a few airsoft barrels. People often sell their used/stock barrels when they upgrade to tightbores, so you can find cheap (fairly accurate) barrels for $5-$10 locally or on classifieds. If I built your diagram to scale, though, I'd ...

The idea I had was to create an air reservoir filled with air via a bicycle pump. The reservoir might lead to a valve of some sort, and on the other side of that, a barrel.

This may in fact be possible :P

Here's what my first pneumatic looked like:
http://i.imgur.com/ANA3Z9O.png
It cost about ...

Here are my findings after a quick build and some tests.
http://i.imgur.com/n7mp1oH.jpg

1) The video (and the detailed construction plan) has no mention or warning about pressure ratings on the parts used. Are these parts, especially the unspecified ball valve, really safe with 800-900 PSI? Do I ...

Hi all. I have experience with pneumatic and combustion cannons, but I'm interested in using 12 gram CO2 cartridges and I could use some clarifications. I want to copy this design that I found here :
http://i.imgur.com/FgTVP0Z.png

I understand CO2 operates at extremely high pressures, so steel ...