What the heck is HFC 134a?(gas)
 

im looking at guns on 007 airsoft, and i like the KSC Glock 23F (HW). it says it runs "HFC 134a" gas. what the heck is this and can i use propane/greengas instead? also, i have no clue what the HW stands for. definatly not a noob or anything:P. thanks alot for any help.

HFC 134A is duster. HW = heavy weight. READ MAN READ!!!