Some people seem to think that all older wiring is bad. There is
likely nothing wrong with that armored cable (AC).

Most of the AC in the house is in very good condition and I was able to get
a ground through the armor on almost all outlets. But for some reason the
armor is not grounded at this outlet and the two that come after it. The
section is grounded that you see in the picture so the ground is lost in the
wall. Maybe the cable is damaged. The outlet is only a few inches above that
so I just feel safer knowing that I'll have a good low resistance ground
with new romex.