There are lots of guys who have hpa guns, this forum just seems to have more guys into springers, pumpers, and CO2 guns. Your dealer will know exactly what you need, and once you get the hang of it you'll find that there are lots of places to get cheap fittings.
I did what Gene did, I connected a male foster quick connect to all my different gun fittings and plug them into a female foster quick connect, and I would just change them out in a second it's really very simple.
Dont hesitate to ask, I can take pictures if that would help you understand better. Hpa fittings are very similar to bulk CO2 set-ups.