the following information is meant for informational purposes only. i take no responsibility for anything you may do with the knowledge gained from this write up. propane can be dangerous and should be handled with care. i can not be held responsible for any damages or injures caused by this write up
this would be my newly constructed propane adapter. if you have ever played airsoft before you should know what green gas and the ridiculous price they charge you for it. for all of you who haven't played green gas is essentially repackaged propane sold at about 3 times the price (ok sure... they add a little silicon but its still way over priced!!!) i have included a picture of a can of green gas notice the type of nozzle becuase we are going to need to remove it later
now a lot of airsofters realize green gas is a waste of money and buy custom made adapters for $20 - $30 that allow standard canisters of propane to be used with their guns. i have done the same thing except instead of using CNC machined aluminum my adapter was constructed with off the shelf brass parts. this means all of you could make for very own!
Step 1: Parts
benzomatic torch head (modified)
1/4" brass coupler
1/4" brass nipple
1/2" brass compression nut (you will probably need to buy the whole compression fitting)
1/2" to 1/4" brass bushing
empty can of green gas (MAKE SURE ITS COMPLETELY EMPTY!!!)
an o-ring (sorry i dont know which size)
(sorry no picture but i will probably be making more of these so ill upload some soon)
Step 2: The Plan
i have taken a few expanded view pictures of internal workings of the adapter, it is actually a very simple device. the hardest part of the entire build process is cutting the green gas nozzle down to the right size
Step 3: Acquiring a Green Gas Nozzle
what needs to be done is essentially the decapitation of green gas can. but before you even attempt this make sure the nozzle is still good and there is no pressure remaining in the can (go outside and hold the nozzle down to be sure). after the can has been checked begin by peeling off the valve assembly with pliers there should be a lip you notice on the top of the can this is what you're trying to get off (you may need to start it with a flat head screw driver). the next step would be crushing the top a little bit so the valve assembly can be pulled out (if you are using the same green gas can as me you will notice the valve assembly is bigger than the opening in the can this is why it need to be crushed). now that the valve has been removed for the can it is safe to use power tools such as dremels. the idea is to cut the nozzle down to the size just small enough to sit inside the compression nut and make sure it has enough room to make a good seal with the o-ring! im sorry for the lack of picture in this section all i have is one shot of a finished valve...
Step 4: Building the Nozzle Holder
that was the hard part the rest is pretty much screwing fitting together. after the valve has been finalized (filled and flattened to make a good seal ) place it in the 1/2" compression nut then insert the o-ring. heres a pic of what it should look like...
Step 5: Completing the Nozzle Holder
next Teflon the 1/2" to 1/4" bushing and screw it into the compression nut. notice how the brass bushing has an extremely smooth surface on it this is to make a good seal on the o-ring to be sure no propane escapes (propane leaks = very bad). tighten the two fittings just enough to make a good seal with the o-ring but not so tight that the o-ring might be dislodged or torn. then Teflon the 1/4" nipple and screw it into the bushing.
Step 6: Making a Threaded Propane Adapter
this step should be done with great care. the first thing you will need to do is cut the torch head about a centimeter below the 45 degree bend in the shaft. next sand and roughen up the top 2 or 3 centimeters of the torch head in preparation for gluing. then mix up some epoxy (the good stuff like JB weld none of that 5 minute quick set crap) and coat the sanded area with it. next slide the 1/4" coupling over the glue making sure there is good contact between the two brass parts and be sure you leave the top half of the threads clean so that the two parts can be threaded properly. once again i am sorry for the lack of photos...
***this is the weak point of the adapter if any part were to fail it would be the epoxy. that means if it were to be dropped to hardly or improperly glued the two parts could come flying apart and possibly hit someone or something, so be careful.
Step 7: Finalization and Testing
apply Teflon tape screw the threaded adapter into the newly completed nozzle assembly and you should be good to go (assuming you allowed the epoxy 24 hours to dry) after the device is complete connect it to a propane tank and submerge the adapter in water (but not the tank). next watch for bubble, even very small ones. if you see a constant stream of them it means you have a leak and that you need to tighten or glue a part a little more. if there are no bubble the device is ready for use!
Step 8: Usage
1)screw in propane tank
2)turn valve all the way "on"
3)invert tank/valve/adapter and insert into mag or clip
4)hold in position for about 10 sec to be sure pressures have equalized
5)remove device from mag or clip and turn "off"
6)buy something awesome with all the money your saving from not buying green gas
optional step 7) add silicon to mag
because your using straight propane there is nothing in it to lubricate your gun this is not such a big deal if your using a crappy NBB from you local walmart but of your using a high end $100+ blow back you will want to lube up the moving parts every so often with silicon spray