The trigger safety sticks out a little proud when fully depressed. That always bruised my finger.
So I wrapped some sandpaper around a dowel and sanded down the safety lever until it *JUST BARELY* protruded from the trigger's face when fully depressed.
There's still *plenty* of meat there for its intended function, and it functions flawlessly. (still blocks the trigger's movement when out, easily clears the frame when pushing on the trigger with your finger.)
And I stopped getting bruises.
I'll take pictures if you want.
Oh, the smooth triggers are less bitey than the serrated ones. They're easy to swap out and don't cost much.