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Don't know, but not for lack of trying. If you find out let me know. Closest I've found so far is a piece similar in diameter, but otherwise completely different - an experimental Aerojet piece for practice use from the SUU-13. If this is related it's only part of the whole.
Looks like a rotating band on it ... almost like an incomplete 40-MM round to me. Although I have to say I have seen something like it before. I will keep looking see what I can dig up.
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