Tuning New Hatsan Mod 95 Vortex .25 Cal

You're very welcome. Owned and still do a few Hatsan models among 25 or so rifles. Still have a 95, a couple 87 QE's, and some Edges. They all do that new and a little oil makes it stop. Just keep on eye on the back stock screw, it's the one behind the trigger and can loosen over time. A little Blue Loctite 242 you can buy in any auto parts store will take care of that, just follow the instructions.
 
To be honest, I don't know even remotely as much as I'd like to about everything to do with air guns, but Hatsans were among the first I bought getting back into shooting and I bought more than a few. My first was actually the standard Model 95 in .25 with just a regular muzzle break so at least in this case, I have a little experience with them, so happy I could help a little...lol.