The DPx HEST /F has adjustable pivot tension and teflon washers. We specifically asked Lion Steel to tighten down the pivot tension hard and I did it again on the LE's. As Nathanwind pointed out when shipping a knife (even in the US) officials can "determine" that the knife does not meet regulations. In Australia the customs folks can flick the thing all day until they determine that its a "flip" knife. Keep in mind Managiao Italy is the home of the switchblade so we were extra cautious.
That being said, the HEST/F is a brutal use knife that means it is designed to be abused, without lubrication, in mud, sand, dirt, salt, dust, sweat etc. So the moving parts are thick, heavy and require a modicum of seating The material and finishes on the HEST were chosen not for how it looks when new but after being beat to shit after a few years. This means that the initial knife feel will be tough and crisp but will seat in.
Notwithstanding that, I or Gianni will personally look at your knife and tune it, replace it or do what needs to be done to make it work perfectly. As I have mentioned before I spent three months with my HEST/F abusing it in Burma and is smooth, dependable and only requires a minor strop, a washing in river sand and a good wash to get the crap out of it.