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Bryant Ridge's Analysis: The Smith & Wesson Model 639 is an upgraded version of the Model 39, a semi-automatic pistol that was initially used by military and law enforcement. Smith & Wesson's first-generation metal-frame semi-automatic pistols started with the Model 39, which was released to the civilian market in 1955. As more similar designs were created, the Model 39 became known as a "first generation" design. Second-generation models have three digits in their model number, while th …