NOTE : This material is only for educational purpose.
You Will Need :
- 12 Gram CO2 Quick Change Adapter
- PVC 2"(inch) diameter pipe about 15.5"(inches)
- PVC 2"(inch) Cap
- 90 deg. steel pipe elbow
- 1"(inch) long steel pipe piece
- Steel pipe Ball valve
- 5"(inch) long steel pipe piece
- Steel pipe reducer
Process :
First lay out all the pieces you bought and try to think through the construction for the LAW. The 2" diameter PVC pipe will need to be no shorter than 12 inches or so. Of course the longer the pipe the greater the accuracy but also brings down your mobility. Honestly you don't want a long barrel, about 15 - 16 inches should be the perfect balance. The barrel will be a low pressure area It will not need PVC glue on the cap but it wouldn't hurt, a good bashing on the cement should seat the cap firmly on the barrel.Drill a hole into the barrel near the end with the cap. I used I think a .5 inch drill piece and slowly filed it larger to fit the 90 deg elbow.
When it came time to insert the 90deg elbow I heated it up using a blow torch so when I screwed it in it would "melt" the PVC around the threads.
It worked pretty well.
Assemble the high pressure steel tubing area. Now the Quick Change adapter will screw into the steel pipe reducer. The reducer will be mounted to the long piece of steel pipe and then to the ball valve. Don't try anything smaller than a 5" long pipe you can go longer but not shorter. The pipe will act as an expansion chamber for the 12grams CO2. When connecting these pipes I tried to use LocTite (Red) but this didn't seal all the air leaks. So USE Plumbers tape for all the steel tubing to keep them form leaking. Assemble the steel tubing together using the photos for reference it should be pretty strait forward. You have to really secure these HARD CORE! I used my bench mounted vice and screwed them in as hard as I could. This steel tubing is good for up to about 2000 psi so make sure they are on there really good. When the tubing is charged it will be holding around 500 psi. You'll notice the Ball valve is only rated up to 600 psi so this is why you don't go shorter than 5" pipe.
After assembling all the high pressure areas (steel tubing) all you have to do is screw the 90deg elbow back into the barrel and your almost finished. To finish up the LAW I used a spare piece of wood with some holes drilled into it. I mounted this in the center between the steel tubing and barrel, and secured it with some zip ties I had laying around. This makes the LAW a little more durable and sturdy.
Testing :
When you first pressurize the system take safety precautions. Wrap it up in a heavy towel or something so if something does explode it wont be that bad ;) Use soapy water (normal dish washer soap is fine) from a squirt bottle and spray the steel tubing looking for leaks ( you will see a ton of bubbles if there's a leak). It will be hard to make it 100% leak proof. I would settle for 98% leak proof and be happy. Only charge the system up with a 12gram right before your about to shoot the LAW. I wouldn't leave charged for long since you can never be sure if its 100% leak proof or not.
Depending on the arc when you shoot it should travel about 2-3 houses yards. This LAW wont set and distance records but it will be enough to make it into a buildings window or hit a tank almost as far as your gun can shoot. This LAW also wont shoot past 250fps either. I have made larger more powerful LAWS but none have been this portable.
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