Hey guys I'm new to airsoft and am interested in the KWA MP7. I was just wondering how much green gas a single extended 40 rd mp7 mag would take. I no people say 10-15 seconds of gas but does anyone know that in comparison to a can of 1000 mL of green gas. Other words I'm trying to figure out how many magazines I could fill of a single can to gauge how much gas I will be using. I'm sorry if this is confusing but I'd appreciate the help.