Help I.D. these .12 Flechettes round

Please help to I.D. these .12 Flechettes round , any info welcome

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It´s a 12 cal CAWS ( Close assault Weapon System). Best

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Not sure that the one with the CWP is a flechette loading but here are the flechettes that were used.

Top photo is when they would be loaded into the case with the center fluted to hold 7 of the lower flechettes around it. The black plastic bases of both the center and the individual flechettes will slide back upon firing to expose more of the penetrater.
see the lower photo with just the single extended.
loaded extended

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Hi Harrie,

And this is a drawing of a sectioned one.



Thank you gentleman …