Everyone poo-poos series 80 triggers. I have CGT S80 and it shoots just fine.
Nice pistol, stupid low price for that one.
I don't own any Series 80s at the moment, but I've owned several over the years. There's a difference, but I've never understood the clutching of pearls over it.
We may lose and we may win, but we will never be here again.......
Is your rear sight marked? YB had a couple of their own rear sights. My guess is that the rear was swapped out, if it has no marks. Mine had a Novak and a gold line. I swapped in the heinie rear sight.