If it was an upgrade (I am probably going with Brian's post, that it is not) by DelGrego and Runge, it will likely have Runge's signature hidden in a border. The GI pics aren't clear enough to show it though.
Steve, post a picture of the bottom of the receiver, focusing on the forward two screws.
edit: Blowing up the GI picture of the trigger plate does not show Runge's signature.
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