KJ M9.
NEVER heard of whatever the hell that other one is.
KJ M9 will run no problem on propane aka on green gas out of the box.
Heh ya ASC is a good place to ask questions, I've noticed American & other countries forums are kinda useless. :lol:
As for info on airsoft itself. Go here >
http://en.wikipedia.org/wiki/Airsoft
Welcome to ASC.