HPA VFC HK416

I am selling my HPA VFC HK416
 It has a Wolverine engine.

 Included with:
 ● 7 high cap mags and 3 mid cap mags
 ● HOLO sight
 ● 2 grip
 ● suppressor
 (Everything you see in the photo)

 The replica does fire and works, but I don’t think it works optimal; the fully automatic mode doesn’t work very well either. I’m not sure what the problem is. I think it’s largely down to the hop-up; perhaps it can be repaired. Or at least it could be modified with different parts.