The tube hammer was followed shortly by the Bar Hammer single-shot percussion pistol. Produced in a wide variety of calibers and barrel lengths, the Model 9 introduced a bar-shaped hammer on the top of the barrel which would be less likely to catch on clothing when drawn from a coat pocket. Barrel length was typically 2-6 inches with a smooth bore, while the most common calibers were .30-.36. Retaining the double action, single shot, screw barrel design of the tube-hammer, the Model 9 was a success and was produced well into the Allen and Wheelock era. Though made possibly as early as 1837–1838, the bar hammer was eventually marked with an 1845 patent date.
