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Been practicing with these for many years now, not very useful in a 1vs1 scenario but you're facing a big crowd like a riot, you can carry them in your pocket and just sling stones over, infinite ammo. There's many videos on youtube on how to make one, all you need is some paracord and leather or just paracord if you make a woven one.
Romans used them to kill, true and tried method. Takes practice though.