Smith & Wesson Model 39, Basics, Field Strip, Clean, Lube, & Reassemble. The Smith & Wesson Model 39 was a semi-automatic pistol developed for the US Army service pistol trials of 1954. After the Army abandoned its search for a new pistol, the Model 39 went on the civilian market in 1955 and was the first of Smith & Wesson's first generation semi-automatic pistols. Used by the Illinois State Police and the US Navy SEALs, it was a groundbreaking pistol for use with the military and law-enforcement agencies. The Smith & Wesson Model 39 was the first U.S. designed double action (DA) semi-automatic pistol marketed in the United States. The German Walther P38 DA pistol impressed American ordnance personnel during World War II. The Army Ordnance Corps issued a proposal for an American equivalent to the P38. In 1949, Smith & Wesson began development of the Model 39 DA semi-auto in caliber 9×19mm Luger. Smith & Wesson began selling the Model 39 commercially in 1955. This is considered a first generation pistol. Since the Model 39 came out, S&W has continuously developed the design into its third generation pistols now on the market. First generation models use a 2 digit model number, second generation use 3 digits, and third generation models use 4 digits
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