Is this the one you are looking for?

Even though this is mounted on a 30 cal ANM2 it is the same telescopic sight and mounting base that was used on the 50 cal ANM2 gun. I can see why it was short lived as it sure seems like a very impractical sight to use for air to air gunnery. There are even windage and elevation adjustments on this sight!
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Thank you!
Taigh Ramey
Vintage Aircraft, Stockton, California
http://www.twinbeech.com'KEEP ‘EM FLYING…FOR HISTORY!'