I stopped by the hardware store on the way home from work, got a fresh propane bottle.
tried heat
tried right to left, and left to right.
solid bench, heavy vice with hardwood and masking tape padding.
it would not come out.
I took a saw and carefully cut it from side to side, almost to the bottom.
flipped the slide upside-down, and hit the rear of the sight once with a puch, lifting the rear.
Only then, ,was I able to tap it out