Speargun - Wikipedia

How to Rig a Speargun: 7 Steps (with Pictures) - wikiHow Fitness

Imagine a knife that has hinged barbs on the end of the blade pointing backwards, so that when you stab something with it, the barbs will unhinge while the knife is inside

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How to Rig a Speargun: 7 Steps (with Pictures) - wikiHow Fitness