Air Arms Owners Club

I have adjusted the trigger as best I can and it is usable but could be a lot smoother.
I have read that doming the grubs screws can improve the situation but I am a bit cack handed and frightened of ruining the threads.
Can I buy pre domed grubs?

Not sure but doming them is simplicity itself. Hold the screw on the correct size allen key and round it off on an upturned belt sander, then polish with finer grades or abralon disc. Or do it the long way by rubbing and revolving on a sheet of sandpaper.
You can always get a few grubscrews to practice on first.

here:- viewtopic.php?f=5&t=1090