Air Rifle Headquarters has a tune kit that will fit it. Add a Charlie da Tuna trigger and you'll have a very nice shooter.
That's the correct trigger for the hornet grt 3 triggers fit the earlier version gamos such as the Big cat 1200 and hunter 220/440 rifles Arh has a tune kit with McCarri 3650 spring apex seal and lubes for around $50 I have this kit in my big cat 1200 with grt 3 trigger and the rifle shoots awesome !! Gamos are fairly easy to work on so should be an easy tune for you Good luck Gamoshooter
So shot it a good amount today, wow that trigger is horrible. Hard to tell if it will be accurate, he is borrowing a scope that came with the 125 sniper and it pretty bad plus the trigger. at 10 yds its under a dime with rws so might see at 20 tomorrow.Funny though, shot it a bunch just now and then took out the 97k. It feels like it has a hair trigger now lol