Weirdest plausible firearms

What are the weirdest plausible firearm designs that could have been created, or weren't popular but could have been?
 
One of the weirdest actually used ones are the pneumatic dynamite cannons. Several US coastal forts and at least one warship were outfitted with an air powered dynamite launching guns. Teddy Roosevelt used one in Cuba apparently.

During the Civil War there is a story of a spinning machine gun. Basically a drum is spun up to high speed and round bullets dropped in. The bullets spin up to high speed and then are let out of an opening to fly down range. The reports say it worked well but it wasn't adopted and the gun was lost. I also imagine it was a pretty big machine.

It's post 1900 but the Gyrojet rocket guns are fascinating. But because it fires a rocket rather than a bullet it's mostly harmless at point blank range but accelerates as it goes.
 
During the Civil War there is a story of a spinning machine gun. Basically a drum is spun up to high speed and round bullets dropped in. The bullets spin up to high speed and then are let out of an opening to fly down range. The reports say it worked well but it wasn't adopted and the gun was lost. I also imagine it was a pretty big machine.

It was. A working model was built on Mythbusters. Holy crap was that thing ever awesome and scary.
 

Dirk_Pitt

Banned
One of the weirdest actually used ones are the pneumatic dynamite cannons. Several US coastal forts and at least one warship were outfitted with an air powered dynamite launching guns. Teddy Roosevelt used one in Cuba apparently.

During the Civil War there is a story of a spinning machine gun. Basically a drum is spun up to high speed and round bullets dropped in. The bullets spin up to high speed and then are let out of an opening to fly down range. The reports say it worked well but it wasn't adopted and the gun was lost. I also imagine it was a pretty big machine.

It's post 1900 but the Gyrojet rocket guns are fascinating. But because it fires a rocket rather than a bullet it's mostly harmless at point blank range but accelerates as it goes.

Are you sure you don't mean the GATLING GUN?
 
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