How do you undo a backwards firing pin for a 380 lorcin?

Answer 1

Clear the pistol, remove magazine, remove slide, remove firing pin, turn it around, reassemble pistol.

The problem is that step 3 (remove the slide) may be difficult. The problem is that, with a backward pin or sear, the slide may be difficult to pull back far enough, or it may be difficult to push the takedown button in far enough.

You will probably need a small screwdriver with a thin blade, and you'll need to push the takedown button forward while inserting the screwdriver between the button and the slide -- most likely on the bottom, but perhaps also on the sides. There is no magic, predefined motion here; you'll need to pry GENTLY up/sideways while continuing to try to work the button forward. With luck, you'll get it far enough to disengage from the frame, and at that point, the slide is off. The rest is easy.