Maybe my eyes are messing with me or I just don't know what I am looking at but that looks like an old PMI with an under cocking kit of some sort although I don't know how that would work
https://www.ebay.com/itm/20564233092...Bk9SR_6QrZGLZg
https://www.ebay.com/itm/20564233092...Bk9SR_6QrZGLZg
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