The "board gun" theory was mine. The BS story with the gun was that SA made seven guns starting with one zero and going to seven, that 0 went to MacArthur and this one was hanging over the SA Commandant's desk. Others have called them experimentals. My guess that they are board guns arose from this picture that came out of IHC. I know lots of things walked out of SA when it closed, and the guy I bought this from worked there.
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