I lived in Japan for 2 years and bought tokyo marui airsoft guns, but need gas

[Firewalker]

If you must purchase duster:

Buy:
http://www.thesourcecc.com/estore/Pr...roduct=6404350

(Specifically, as this is the type of gas you're supposed to use as it wont eat away at any of the rubber parts)

Then buy:
http://www.airsoft-innovations.com/product4.html

You're set.