This is what was (and is) used on the other side of the iron courtain:
http://www.ebay.de/itm/ORIGINAL-NVA-FLAKFERNROHR-TSK-10x80-UDSSR-TZK-FERNROHR-FLAKFERNGLAS-ZUBEHOR-/282046597943?hash=item41ab498b37:g:nccAAOSwyLlXoEJI
In germany, the most common - and choice of the german national team - accuracy rig is the Spekon "Style Expert" harness with "RL16/3" main...
...but i think this would be real rare in the US.