The Colt Revolver is a revolver chambered for the .357 Magnum round. It was first seen wielded by the first chronologically-appearing A.T.P. engineer, who used it to shoot Sanford in the stomach. Later on, Sanford grabbed one from a civilian in Madness Combat 6.5 and, in Madness Combat 9: Aggregation, used it as his primary weapon along with his hook. After being chased by an enhanced engineer, Sanford discarded the revolver for a rifle.