20mm projectile ID help

M55, UNKNOWN, PGU

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We saw ID requests for this one before and so far I saw no positive response.
Worth to mention that it obviously is a 20x102 (before someone will ammend the thread title).

Here other images from the web.
To what I see this could be sort of a flechette round. Your’s here being a TP.

20x102_various_USA------ 20x102_various_USA-------

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The unknown projectile is a GPP(General Purpose Projectile) round (i did ask the same question a while ago…)

Thanks!