[lurkingknight]

or unless you know where to find hfc134a. It IS still commercially available in select retailers, but the can I just picked up was 8$ where that could've bought 2x the amount of propane. But given the fact that it can be very hard to get certain tm pistol parts, I will run the duster on guns only when temperatures make propane very high pressure.

134a will be marked as hfc 134a or under the contents it will list the chemical compound name of tetrafluoroethane, so read your labels. Other gasses may be corrosive to any seals or other parts, so use those other gasses at your own peril.