That's what makes a LeMat specialJust curious, what is the function of the tube under the barrel?
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.
http://www.forgottenweapons.com/rifles/lemat-revolving-carbine/Do you have pictures/documentation that such a longarm existed?