<Tr> <Th> Feed system </Th> <Td> 9 - round cylinder; single - shot smooth - bore secondary barrel </Td> </Tr> <Tr> <Th> Sights </Th> <Td> fixed front post and rear notch </Td> </Tr> <P> The LeMat revolver was a . 42 or . 36 caliber cap & ball black powder revolver invented by Jean Alexandre LeMat of New Orleans, which featured an unusual secondary 20 gauge smooth - bore barrel capable of firing buckshot . It saw service with the armed forces of the Confederate States of America during the American Civil War of 1861--65 and the Army of the Government of National Defense during the Franco - Prussian War . </P> <P> This unique sidearm was also known as the "Grape Shot Revolver ." It was developed in New Orleans in 1856 by Jean Alexander Le Mat, whose manufacturing effort was backed by P.G.T. Beauregard, who became a general in the Confederate States Army . Fewer than 100 were made by John Krider of Philadelphia, Pennsylvania, in 1859, including the first 25 prototypes . It is estimated that 2,900 were produced in Liége, Belgium and Paris, France . The European made pistols were shipped through Birmingham, England, where they were proofmarked . </P>

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