Hatsan Vortex v2 compression force

Been a few years since I bought a new Hatsan so honestly no clue other than at some point, they removed the bleed screws that used to be on the back end of their better Vortex rifles.
If you aren't a member of the GTA airgun forum, you might consider joining. They have a Gate just for the Turkish rifles and someone over there might have an answer to your question. You could also take a shot and email Hatsan Arms in Turkey and see what kind of answer the people at the actual factory give you.