Groombug, exactly what I was looking for, thanks. I'm suprised no airsoft companies have made a knock off mount yet, they were pretty quick to jump on the NSW M4 wagon with the crane stocks and shortened barrels.
I did find a KAC mount that is similar, although at $130 USD, it's a little too much.
Also,
www.mstn.biz sells PRI products, but they do not have the extra tall SOCOM mount listed. I think based on the pics he provided in that thread on ar15.com you linked to, he can get it.
Damage, thanks for the link, but the Guarder mount is still a little shorter than what I'm looking for, looks about the same height as the G&P mount I currently have.