Here's the link to see what I think is the 1st Drop Port on a Stolle Panda Action. Thanks to 'Stick' at S&S Precision Rifles for doing the modification work on my Stolle Panda 30BR action.
http://www.youtube.com/watch?v=yUV6r49xoqs
http://www.youtube.com/watch?v=yUV6r49xoqs