Vulcan 2 or Huben K1

I don't own either, but like you the Huben appeals to me. I found a video on disassembly and it looks much less complex than i imagined:

https://www.youtube.com/watch?v=K0xgcZ5HWAs&list=FLx-PqXp8wIFL9YTxlwbstUQ&index=3&t=0s

I've never owned either gun but I have shot my buddy's .22 Huben and it is pretty dang slick. If I was in the market for another gun it would be at the top of my list. He has his shooting the 25 gr jsb monsters at 890 I think and the more he shoots it the better it gets. Very accurate and powerful plus gets a lot of shots. Also fairly quiet . He is very happy with it.

Cant help with the Vulcan as I've never handled one but from what I hear they are great guns too. I do have a Taipan Veteran .22. Kinda boils down to side lever cocking vs semi auto.

I got my new Huben in 22 cal from Kelly at krazcool.com and I like it a lot! Took me awhile to figure out how the regulator adjustment and the power wheel adjustment work together, but I've got it pretty dialed in at the moment, shooting pollymags at an average of 950fps. Also have shot some of Nielsons 36 gn slugs, no problem. And the JSB Monsters, and Beasts too. The way I have it set now, for the pollymags, I can get 57 shots (3 mags) before refilling to 4000psi