I have had my
Hatsan Edge (Vortex gas piston) .22 cal since August 2017.
When I received the gun, due to a problem in transport I assume, the piston was defect. Where I live there is no Hatsan, there is no PA, just nothing, so I just had to bite the bullet and pay to get
a new piston installed.

The responsible gun smith was irresponsible, and said nothing about putting in a smaller piston than the original, instead of 20FPE I’m getting about 13 to 15FPE.
The scope the rifle was packaged with a Hatsan “Optima 3-9x32” – now that is just a sophisticated equipment for self-frustration, as it does not have any parallax adjustment (and is adjusted to 100 yards, so continually blurry at typical airgun ranges). I’m not sure it would hold zero.
Well, I got myself a Leapers UTG 6-24x50
scope, much better, still under $100, and now I was actually making progress.
I learned the artillery hold.
And I’ve shot around 3000 pellets over these past 1.5 years, that's over 5 pellets each and every day....!
At 33 yards, I’m getting 10-shot groups of around 2", when the wind leaves me alone (field rest).
At 60 yards, I’m getting 2.5" to 3" groups (10 shots, with the right pellets, and low winds, and high concentration, field rested).
Now, my scope has lost zero twice in the last couple of weeks – it just decided to shoot 3" high. Not cool. I realize that I get what I pay for (sometimes a bit more, that just depends). I’m basically done with spring-rifles, for a hole litany of reasons not necessary to elaborate here. And I’m done with cheap scopes as well. The forums have been teaching me this (and many many other things): Buy once, cry once.

==>>
For getting results twice as good as mine, without messing up scopes due to the double recoil of a spring-powered air rifle (steel spring, or gas spring like the Vortex), I recommend getting an entry level PCP for 200 to $300, a 40$ Chinese pump, and I think you’ll never look back.

But if you don’t want to mess with filling airtanks & amp and stay with springers, I’d go for the SIG Air ASP20 or the Diana 340 N-TEC – they are powerful for longer ranges and hunting, but according to airgun pope Tom Gaylord – much less hold sensitive than others. And high quality (as in “pass-on-to-your-children”-quality).