Polish P-64, it has a trigger pull in DA that made me thing the gun was litterally broken, I couldn't pull it, But it worked in SA, and the single action, is about 2 pounds, so you got a gun you have to be on adrenalin to pull the trigger in DA, but then it's got a pull like a 1911 race gun in SA, VERY bi-polar...
On the SKS, I did a trigger job before I really knew anything, basically smoothed everything (I would have trimmed the springs... but I couldn't figure out how to get them off the captive rod)
The only thing I didn't touch was the sear, now I have a 5-6# pull, really smooth, but get this, it stacks, so you can take it up till the last 2oz and have the pull be like a target gun. I kinda hate stacking the trigger, cause about the 3 or 4th one I'll scare the Begeezuts out myself.