Not heard this as far as I know we use propane gas with a lubricant to stop seals degrading.
As propane isn't being banned as far as I know I see no point.
Free speech is expensive these days!
If you're on about HCFC's being banned in the near future, then you're correct. This covers 134a and R22 refrigerants (AKA *bog standard* gas, and *proper* Green Gas) HCFC's (like the now banned CFC's) are ozone depleting materials.
ALL Japanese gas guns are designed to run on 134a (hence why you see most UK retailers saying that warranties only apply if 134a is used) However, most of what is termed Green Gas is not in fact R22, its Propane, and as thats a straight Hydrocarbon, carry on using it!
When we were a Kingdom it was run by a King
When we were an Empire it was run by an Empress
Now we're a country we're run by a..........
Bit confusing, this gas lark. Manufacturers haven't helped by almost complete lack of clarity or contents description. Hell, some players might even think of swapping to 'green' gas as it's kinder to the environment!
If someone can put together an accurate and authoritative guide to airsoft gases (what they are, where and when to use them) then I'd be more than happy to sticky it for the benefit of all...
Some info on gases and when to use them would be great. Having been into airsoft for a year and a half now. Im still a little wary about wrecking my GBB's. Especially now i own a Marushin Carbine.
I dodnt know my shooters ran on gas, I can only find the battery leads, where the holes to put in the gas then 
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To be honest, the manufacturers insistance on using 134a is due to the higher temperatures in other countries like Japan, Asia and America, which make 134a more suitable. Here in Blighty we only have to worry about using green gas/propane for two weeks of the year, the rest of the time they pose no problem.
I have used straight propane in a Western Arms gbb for 4 years and 18,000 rounds with no problems whatever.
I also use it in my Marushin M2 carbine/KJWorks Beretta m9/ Tanaka S&W M629.HSC Glock/Tanaka Mauser / Tanaka Luger ( modified) and many others with no problems. Occaisionally airsoft guns do break but this happens regardless of which gas you use.
The only problem I would warn about is this,..... if the temperature is above 24 degrees C, only use green gas in modified or all metal guns. On those hot days then play safe and use 134a.
Also , Abbey ultra gas is around 10% lower pressure than green/propane , so that may be a safer option in some weapons.
ftj
"REMEMBER, LIFE IS NOT A REHEARSAL"
