I have an original factory Sako trigger which will fit any of the L or A series rifle. I believe it is referred to as a #4 trigger. I replaced the screw which tightens against the receiver because someone had damaged the original screw with a slot head. The screw I used has an allen head slot which works with a 2.5mm key. I tried this on my L461 receiver and it works perfectly.
I am asking $100 shipped to the continental US.