Duster is simple computer/electronics duster gas. Fairly low powered but safe.
Propane is the same as Green Gas you hear about minus a drop of silicone oil.
The simplest system in the long run (pays for itself in less than 2 events) is the Propane adaptor and simple propane tanks you get from any hardware store for dirt cheap.
If your gun is designed for 'green gas', that is what you want to do.
Pure silicone oil can be bought from any decent Hobby stores.
Read the FAQ a bit more, you're on the right track, or (broken record) go to a local game to see all this in person.
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