The .436 Deane and Adams was a five-shot percussion (cap-and-ball) revolver with a spurless hammer, and the first revolver with a solid frame. The revolver used a double-action only system in which the external hammer could not be cocked by thumbing it back, like most other pistols of the era, but instead cocked itself when the trigger was pulled. This made it possible to fire the gun much more rapidly than contemporary single-action revolvers, such as the Colt, which had to be cocked before each shot.