What is on the bottom of this barrel on this excavated Belgian pinfire revolver?

Firearms | Armes à feu
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What is on the bottom of this barrel on this excavated Belgian pinfire revolver?

excavated
excavated4660×3672 4.34 MB

This revolver was recovered from the sand in Beaufort, South Carolina in an area that saw activity during the American Civil War.

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Perhaps a sort of baïonnette or knife

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+1
An another exemple

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I thought it may be a way to attach a bayonet to it but could not find any other examples like this. Thanks!

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It seems to be a custom made rib to attach a knife, like for a bayonet..