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Run it off compressed gas kind of like an airsoft LAW or Grenade launcher.
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That is pretty much the way to go, but try carrying a 20 litre tank of 200+ PSI CO2 or air with you. Your basically talking about huffing a scuba tank into the field with you.
Duster and paintball CO2 rigs could work relatively well.
But surprisingly the best luck we've had is disposable Co2 catridges. You can buy a gadget that uses them to fill bike tires and the like with a std Schroeder valve on the end. But with a mortar you need 2 per shot, they still have weight and there not cheap.
and before anyone says it *cough*AMOS*cough*
PROPANE IS A DUMB IDEA
PVC OR ABS + FOAM = STATIC
STATIC = SPARK
SPARK + PROPANE = PVC PIPE BOMB