That's what I do, yes. I'm not sure if that's the "right" way, but it's been working well for me thus far.
What I believe happens (anyone feel free to correct me) is that the propane in the tank is in liquid form and remains as such as you fill your mag. The oil goes into the mag mixed with the propane.
Originally Posted by OptimusPrime
I could never stop going to WalMart. Its the only place I can get good airsoft guns.