Tuning hatsan alpha

Which one do you have? The older versions are pretty much built along the same lines as the Edge/Striker/1000 series rifles only with a less powerful spring in them and I believe use the same trigger.

The new, shrouded barrel version looks kind of like a smaller version of their AirTact at least in pictures and may well be built the same way including possibly the trigger?? While I own an AirTact .25, I've never seen anyone mention they have a new version Alpha.
 
Either of these look like yours? Top is from an Edge and also used in the older Alpha. Bottom is from a new AirTact and maybe? the same used in the newer version Alpha. 

side by side 8.1629691997.jpg