I think this might work and solve the portable dilemma...

[chosen_way]

dont do it unless you want to get blown up, you wont be able to controll the amount of pressure in it meaning it will go boom after a while. but other than that it is a good idea i mean if you are suicidal. you could do a test one where its just a remotely activated sprinkler valve and you just see what kind of pressure you could get. just buy Co2 and use that it would be alot cheaper or do what i do and use propane because Co2 is to expensive here in australia.

[MrCrowley]

to stop being blowen up just put a 125psi saftey pop-off valve

[pyromanic13]

it seams like everytime some one comes up with a good idea theres 3 people to put him down! all potato guns a potentialy dangerous but we take precautions for that reason. I say go for it!

[BC Pneumatics]

it seams like everytime some one comes up with a far-fetched and dangerous idea theres 3 people to point out easier, cheaper, safer ways, and potentionaly save his life! all potato guns a potentialy dangerous if you act like an idiot, but most people are smart enough to be safe around them. I say you are a moron!

[pyromanic13]

dry ice in a steel chamber, pop off valve, and pressure guage, metal valve. how is that stupid? mine works fine.

[BC Pneumatics]

It is rather stupid IMHO, not for safety risks, but becasue there are much cheaper/easier/quicker ways.