I've just recently bought a second hand Automag with no bottle. Because of cost I'm going to run it off CO2, but after looking through an old copy of PGI which covered marker maintenance it said to use CO2 Vapour NOT CO2 liquid as it seaps into the O-Rings and degrades the performance. I know most sites run off CO2 but I didn't know there were two kinds. I'm I worrying about nothing because everybody who runs CO2 uses Vapour or is a special thing just for Mags. Advice Please