![]() Two, four and six inch barrels were standard length. The MK III line was discontinued in 1983. Colt stayed with the older engineering in regards to the Python, Diamondback, Detective Special, Officer Model Match, Police Positive and Cobra models. The result was a line of revolvers that was more economical. Using these parts virtually eliminated hand fitting, significantly lowering labor costs associated with the assembly and manufacture of the MK III line. The sintered parts also allowed for improved fabrication tolerances, and could be given a special heat treatment resulting in a harder more wear-resistant composition. ![]() ![]() It also vastly improved on the earlier design in durability, and offered the advantage of employing sintered iron internal parts rather than expensive forged ones. ![]() This lockwork was not only more sophisticated, but inherently safer due to its superiority to the older hammer-blocking designs the revolver could fire only if the trigger was deliberately pulled completely to the rear. The new revolvers were considered groundbreaking as they were the first modern revolver designs to employ a state of the art transfer-bar lockwork system. Intended to be the first major advancement of Colt’s designs since the beginning of the 20th century, the MK IIIs used a new ‘J’ frame and had no parts interchangeability with older models. This made significant engineering changes to the Trooper, and Official Police models. The MK III line of Colt revolvers was introduced in 1969.
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