What Air Fill Comes On A FX Wildcat .25?

Greetings, I'm purchasing a CF bottle for a yet to be delivered Wildcat .25. The bottle seller asks whether the Wildcat uses a Probe or has a male quick disconnect on the rifle. Relying on the collective wisdom here.

Also, he states that a 2nd Gauge as well as a  "FQD x FQD" & "MQD x DIN300" are generally purchased with the bottle.
I understand the 2nd gauge but am fuzzy on male disconnect/DIN300


thank you
John