1/What are the barrel threads on the Azodin KPC+?
The KPC+ uses Autococker barrel threads.
2/What is a Auto Trigger?
An Auto Trigger, like what is featured on the Azodin KPC+, allows you to hold the trigger down while pumping, and once the pump handle is forward, the marker will fire without having to pull the trigger after each pump.
3/Does the Azodin KPC+ need to use an electric hopper?
No, there is no need for an electronic hopper on a pump marker.