The Colt revolving rifles were early repeating rifles produced by the Colt's Manufacturing Company. They were mainly based upon the patent and mechanism of already existing Colt revolvers like the Colt Sidehammer or the Colt Dragoon. The design of the Colt revolving rifle was essentially similar to revolver type pistols, with a rotating cylinder that held five or six rounds in a variety of calibers from .36 to .64 inches. The Model 1855, which was the most widely produced revolving rifle, was available in .36, .44 and .56 caliber. Four barrel lengths were available: 15, 18, 21 and 24 inches. A six shot cylinder was used if the caliber was .36 or the .44. If the caliber was .56, a five-shot cylinder was used. The revolving rifle used percussion caps, like revolving pistols of the time. A cartridge consisting of powder and a lead ball were loaded into the front of the chamber, and were then compressed with a plunger that was located beneath the barrel. Once the cylinder's chambers were loaded, percussion caps were placed over the vent nipples at the rear of the cylinder. The weapon was now ready to fire. In addition to being susceptible to chain fire problems, the revolving cylinder design also tended to spray lead splinters into the wrist and hand of the user. Revolving pistols did not suffer from this problem since the user kept both hands behind the cylinder while firing a pistol.
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