Why look, it's a can of butane!
A can of PC duster, sans trigger assembly, leaving white nub visible.
This butane nozzle looks remarkable similar to the nozzle on Green Gas cans. Too bad the can is full of butane!
The valve on this magazine will readily accept the forthcoming duster nozzle.
These are the adaptors, convienently found on the underside of the butane cap.
The little red thing is the adaptor you want.
Here's the adaptor on installed on the white nub. It's friction fit; no glue neccessary.
Filling a mag with the adaptor in place. Um, you should hold these in both hands... I had to use one of mine to snap the pic.