Originally Posted by mansopoor
Aside from airsoft guns and RC what else is the oil used for.
In North America? Very little that you'd have access to. It would have to be sourced in large barrels as well. It's uses are mainly industrial, such as in medical labs, in the food industry, distilleries, and pharmaceutical manufacturers. "Airguns" is listed as one of the large industrial uses of it as well as paintball.
It's because of the inert, non-toxic, and protective qualities of silicone that allow it to be used in these industries.
Your best bet if you can't find an RC shop, is to check out local paintball shops and fields. They would use very similar (if not the exact same) oils.