In 1859 Samuel Colt patented a shoulder stock for his revolvers which made the revolver into a carbine or short rifle. This was a way he thought might make his products attractive for military use, and the 1851 Colt Navy revolver was configured to work with these shoulder stocks. Jefferson Davis was Secretary of War and approved the shoulder stock for Army use 1856. Of course Davis later became President of the Confederacy in the War of Northern Aggression (which is what Southerners call the Civil War). The Colt Navy with the shoulder stock option was never a very popular combination, and Colt discontinued the shoulder stock option in 1866.