CO2 cartridge rifle
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stuffbuilder
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Here's my latest project. Its an air rifle with a 4 foot long 3/4 inch barrel made to shoot spent 12 gram CO2 cartridges. I carved the stock and grip by hand from a single piece of teak. All the metal plates also started out as raw sheet metal that I cut and filed down by hand. I decided to go with a manual valve for simplicity and the fact that the solenoid would have been in the way.
- Attachments
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- Here it is. End to end its just shy of 5 feet
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- A close-up of the trigger. Just an ordinary converted sprinkler valve
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- I just glued a thin piece of foam to the end of the stock to act as a bit of padding
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- A closer look at the back of the gun
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jackssmirkingrevenge
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Nice fusion of traditional and modern materials, it has a quirky yet pleasant look 
damage pics/videos!
damage pics/videos!hectmarr wrote:You have to make many weapons, because this field is long and short life
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stuffbuilder
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Ran into a little bit of trouble testing the gun today. Apparently a glob of fiberglass resin doesn't seal up the old pilot valve port on the sprinkler valve. Would a glob of easy-mix epoxy (the stuff that comes as a cut-and-knead stick) made to patch plastic tanks work any better? If not, what would?
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jackssmirkingrevenge
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If you want epoxy to stick to plastic you have to roughen it first, a file is a good idea, dremel is even better 
hectmarr wrote:You have to make many weapons, because this field is long and short life
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stuffbuilder
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After three failed attempts to seal the valve with epoxy, I managed to plug the leak with some superglue and test fire the gun. All the shots were taken from about 15 feet at 80 psi. Not pictured is a piece of 2x4 that I couldn't break (it was pretty small and kept getting blasted away)
- Attachments
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- First shot: a thin piece of paneling. It's only about 1/8 inch thick and broke pretty easily
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- Second shot: a chunk of a pine plank about 3/4 inch thick from the scrap wood bin. You can see the dent left by the cartridge
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- Third shot: a brick I found in my yard. This one actually deformed the co2 cartridge
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pneumaticcannons
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Superglue will eventually fail. Have you tried taking the valve apart and sealing it from the inside?
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stuffbuilder
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I filled the hole where the solenoid was with epoxy, but air still slowly seeped out from around the plug. I just used a little superglue on the inside of the valve to fill in the corners where the epoxy couldn't get.
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beastmode986
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very nice! what did you use for the barrel? it looks like 3/4 schedule 40
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mattyzip77
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Cool gun you got there. you gotta use the two part liquid type epoxy not the knead stuff. j b weld is the best use that cuz the super glue wont last forever. also did you let the epoxy set long enough, like over night?? I bet you didnt. Well nice cannon man...
Go Bruins!!!!
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stuffbuilder
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I used Bondo fiberglass resin. The mixture is mostly resin with only a few drops of catalyst mixed in to get it to harden. I scratched up the inside of the hole pretty well, but no matter what I did it wouldn't completely seal. I let the thing sit nearly a week before I put any pressure behind it.
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mattyzip77
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Ya last time I ckecked bondo isnt made for pressure, epoxy however is,,,,
Go Bruins!!!!
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jackssmirkingrevenge
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Try cutting the cartridges in half and weighting them with a bit of lead melted into the nose, they will fly straight.
hectmarr wrote:You have to make many weapons, because this field is long and short life
y , let it dry 24 hrs then have fun!!!!-
beastmode986
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whats kinda range you getting from it?