
The S&W "Etherium" revolver was a top secret project at Smith & Wesson for years, and only a few prototypes were made. These were actually lighter than air; the metal was infused with microscopic pockets of helium. It was considered unsafe; if one accidentally floated away, who knows into whose hands it might fall. This is the one I was able to obtain; I take it out of the vault and fire it only once a year, every April first - one can't be too careful.
John
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