Sorry about the noob questions but what do you mean it is sleeved?

In the pictures with the 2 different barrels, what kind and size of pvc are you using for each?

Where your wires are touching it sparks...I have that problem too. Normal insulated wires are only good for a few hundred volts. The one you use (given that you have just 1 double A) is about 12,000. In mine I use 2 batteries and have 3 spark gaps and it works wonders. To get rid of the extra spark ...

Will any of the combustion or pressure go back up the hose once fired? Does a person disconnect the hose from the fitting on the chamber before you fire? Do you guys use Schedule 80 at all or does 40 do the trick for a powerful propane gun?

i have the metering devise built and regulated. What is the best way to get the propane from the meter to the comb. chamb.? A lot of people tapped the chamber to accept male NPT. do we have to do that or can i just attach a hose with superglue?

I have the meter and the regulator built and ready to go. I was wondering the best way to get the fuel from that to the chamber without loosing pressure or fuel in the transition.

Do you have to have like a valve at the chamber so pressure does not go back into the hose? I didn't know if that would make a difference.

My buddy and I have been making guns for awhile and we are working on some propane gun designs. When using propane, what is the best way to get the propane from the injector to the chamber? I have seen starman's guns with the air fittings but I wanted to use a direct shot from the injector. We were ...