As Macguyver said, hit a hobby shop and pick up some 10 wt. silicon oil. Put 2 drops on the valve of your propane tank, that should be good for about 10 mags.
BTW, what gun do you have?
Team Bad Karma(BK-09)
CAUTION: Evil Genius at Work
Those that wear the "Tin Foil Hat" stand on guard for thee. All others stand on guard for themselves.