I would advise anyone wanting a VX-3/VX-III to go up another level.  I had a VX-3i and it was junk.  It was supposed to replace a VX-II and after shooting it at 250 yards, sold it and put the VX-II back on there.  VX-II would hold 1 inch, VX-3i was holding about 3 inches.  Same mounts.  Same...