I think that huben k1 already goes by gen 5 or gen 6 and the problems of gen 1 were solved but who can best clarify it is huben who is also a member of AGN
Huben K1 is a rifle with great potential. Although this is already a new generation, it is still not the safest purchase. It still has details that can be upgraded. It is also not cheap. So it may be better to invest money elsewhere for now.
I've got five of them, I had my original one resealed after 4/5yrs. That's all I've had to do and I doubt I would have had to do that but my son emptied it of air while I was away for a few weeks...
I took my original one to an indoor range here in town and with a 32x 1/8 click scope, in a machine rest with hydraulic release it shot -MOA. You can go back through my posts and read about that.