these are flechettes and, while being largely impractical, are bodily devastating when effectively applied. i think they’re banned by the geneva convention but don’t don’t quote me on that.
Aa far as I could find flechettes aren't banned under either hague treaties or geneva conventions rules. Considering their use during both korea and vietnam by the US, unless an agreement has been made since then, i don't see how or why they'd be illegal. The death of flechettes seems to be more akin to obsolescence rather than any rule change.
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