Thanks for the info on the Evike gas, Kevin. I just picked up a WE/Socom Gear 1911. I was planning on using it in the garage. Until I found out a lot of green gas is propane. Hmm that plus water heater, furnace, and reloading stuff didn't sound like a good combo. Google search led me here I didn't even realize benos.com had an airsoft section!
hmm looks like hfc22 might just be another name for propane??