I'd rather have a Greener Harpoon Gun.

That Greener took off like a rocket. I won't be the new owner.

I saw that and still haven’t figured it out. A chemist friend once told me Fluoride is what is also used as rat poison.

Yes and so is the stuff that is used to make your bread. Its all a matter of concentration.

Too much dihydrogen minoxide is lethal, but we can't exist without it.

That gun just screams "Trap shooter"!

Not certain what intended repurpose of that gun would be but it looks alot like a setup for a big game gun with that prominent front bead and rear sight. Could be for trap but it does not have any choke if I read correctly. Most of those double barreled rifle big game guns are designed for close in hunting in case of a charge. 10 gauge with no chokes sounds like an up close gun slinging a big chunk of lead. Supposedly muzzle brakes are designed to mitigate some muzzle jump or I think that was maybe the thought. Would that be a gun you want if there was bear charge or say going after mountain lions.

Regardless whatever it was used for it looks like a funky experiment.