The Smith & Wesson 5906 is a pistol manufactured starting in 1988 by Smith & Wesson. Design The 5906 is a full-sized, double/single-action (DA/SA), staggered-column magazine, 9×19mm pistol. Its construction is all stainless steel. The 5906 is equipped with a magazine disconnect feature which is designed to deactivate the trigger if the magazine is not fully inserted. The pistol comes standard with either a 10- or 15-round magazine. Other features include ambidextrous safety levers, a one-piece rear wraparound grip, and a choice of either fixed sights or a rear sight fully adjustable for windage and elevation. Once a very popular model with law enforcement and military units in the United States, the DA/SA 5906 has been superseded by polymer-framed striker-fired models from Glock, Heckler & Koch, SIG Sauer as well as Smith & Wesson's own M&P line of polymer framed handguns in both 9mm and .40 calibers. Variants The first generation Smith & Wesson semi-auto pistol designations consist of two digits, such as Smith & Wesson Model 39 and Model 59. Second generation pistols are designated by three digits; these include the Model 459, Model 659, etc. Many second generation designs were eventually upgraded with various improvements, thus becoming the third generation pistols; these are identified by the addition of a fourth digit to the second generation model number: 5903, 5904, 5905, 5906, etc. However, there are exceptions to this numbering scheme, namely the third generation Value Series pistols such as the S&W Models 915 and 910, and the Model 457. 5900 series manufacturing history The Model 5903 was manufactured from 1990 to 1997, and featured an aluminum alloy frame and a stainless steel slide with a 15-round double-stack magazine. Produced from 1989 to 1998. The Model 5904 has an aluminum alloy frame and blued carbon steel slide, also with a 15-round magazine, and inspired two other derivative pistols, the Smith & Wesson Models 915 and 910. The Model 5905 featured a carbon steel (blued) slide and frame, and was produced in 1991 only in very limited numbers. The Model 5906, produced from 1989 to 1999, is an all-stainless steel model, and is therefore significantly heavier than the aluminum-frame models in the 59XX series. The stainless steel double-action only variant of this pistol, the Model 5946, along with the Model 3953, produced from 1990 to 1999, was manufactured without safety levers, and is the primary issue service pistol of the