I had a FWB Sport 127 (so .22), that I tuned with the Maccari Old School Arctic kit, put an insulator in it and buttoned it.
Fantastic rifle (and build quality), only thing I still didn't like was the trigger (Also changed for the Maccari ally one), couldn't adjust it just right, and the safety is horrible, it's just a slide but doesn't give any feedback (no positive click).
The only fault on this rifle is the trigger, and safety slide, (nowhere near the 150 or 300, which is IMO the best trigger found on springers).
Regards,
Bart