Lever action carbines, regardless of manufacturer, were typically offered with round barrels that were shorter than the rifles standard length. As previously stated bands were used to hold the forend and front magazine tube to the barrel.The exception was the 32-20 model 1873, and the 25-20 and 32-20 caliber model 1892 Winchesters.These guns had a forend retaining band with a dovetailed foreward magazine clamp. This was due to the smaller calibers' slimmer magazine tube. Marlin, Winchester, Savage, and others made carbines; they are commonly called saddle ring carbines. The ring on the receiver was intended to be used with a sling to assist in control of the gun while horseback. Carbines were available in the same calibers as rifles of the same manufacturers. My model 1886 Winchester 45-90 SRC is definitely not a smaller caliber gun. There are many variations in lengths, but, most carbines had 22" or shorter barrels. I hope that all this abbreviated info makes sense.