We had bouncing betty AI grenades 3 years ago... It is basically a modified tent stake, a rod, some wire, and an AEG spring. They are impractical. But good luck with your project!
PS: Scary as shit in practical application (demonstration).
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Ár skal r?*sa, sá er annars vill
fé eða fjör hafa. Sjaldan liggjandi úlfur
lær um getur né sofandi maður sigur.
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