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speargun
A speargun is an underwater fishing implement designed to launch a spear at fish or other underwater animals or targets. Spearguns are used in sport fishing and underwater target shooting. The two basic types are pneumatic and those powered by rubber bands. Spear types come in a number of varieties including threaded, break-away and lined. Floats and buoys are common accessories when targeting larger fish.
I've been doing some reading on spearguns lately. Most of them out there now appear to be powered by rubberband or pneumatic system. I did, however, find that there were some produced in decades past that were powered by what appears to be a blank cartridge.
Out of curiosity:
How common was...