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USMC marked US Optics Scope

You should call USO to see what the current scoop is. I think they were up to their second or third "last run", and that was a couple years ago.

You can search "MST-100" and find plenty on them. Here are some to get you started:

http://www.snipershide.com/shooting/snipers-hide-rifle-scopes/78298-mst-100-a.html
http://www.snipershide.com/shooting/snipers-hide-rifle-scopes/788-***uso-mst-100s-last-run-***.html
http://www.snipershide.com/shooting/snipers-hide-rifle-scopes/33458-using-mst-100-a.html