The Smith & Wesson (S & W) Model 686, is a six or seven shot double action revolver chambered for the .357 Magnum cartridge. It will also chamber and fire .38 Special cartridges, as the .357 Magnum was developed from the .38 Special. The magnum case is slightly longer to prevent magnum rounds from being chambered and fired in handguns chambered for the .38 Special. The 686 has been available with 2-1/2 in. (64 mm); 3 in.(76mm); 4 in. (102 mm); 5 in. (127 mm); 6 in. (153 mm); and 8-3/8" in. (214 mm) barrel lengths as standard models and other barrel lengths either by special order from S & W's Performance Center custom shop, or acquired from or built by after-market gunsmiths. The Performance Center also made a limited number of 686 in .38 Super for competitive shooters.

Smith & Wesson introduced the Model 686 in 1980. It is the stainless steel version of the 586, which was a blued steel finish. It was chambered for .357 Magnum and .38 S&W Special +P calibers. They are available ported and unported with a choice of 6 or 7 round cylinders.

The Model 686 is based on S & W's L (medium-large) revolver frame. During the 1980s, Smith & Wesson developed its L-Frame line of .357 Magnums: the Model 581, Model 586, Model 681 and Model 686. These Magnums had a major effect on both law enforcement and sporting markets. This model line became one of the company's most popular in its history.The Smith & Wesson (S & W) Model 686, is a six or seven shot double action revolver chambered for the .357 Magnum cartridge. It will also chamber and fire .38 Special cartridges, as the .357 Magnum was developed from the .38 Special. The magnum case is slightly longer to prevent magnum rounds from being chambered and fired in handguns chambered for the .38 Special. The 686 has been available with 2-1/2 in. (64 mm); 3 in.(76mm); 4 in. (102 mm); 5 in. (127 mm); 6 in. (153 mm); and 8-3/8" in. (214 mm) barrel lengths as standard models and other barrel lengths either by special order from S & W's Performance Center custom shop, or acquired from or built by after-market gunsmiths. The Performance Center also made a limited number of 686 in .38 Super for competitive shooters.

Smith & Wesson introduced the Model 686 in 1980. It is the stainless steel version of the 586, which was a blued steel finish. It was chambered for .357 Magnum and .38 S&W Special +P calibers. They are available ported and unported with a choice of 6 or 7 round cylinders.

The Model 686 is based on S & W's L (medium-large) revolver frame. During the 1980s, Smith & Wesson developed its L-Frame line of .357 Magnums: the Model 581, Model 586, Model 681 and Model 686. These Magnums had a major effect on both law enforcement and sporting markets. This model line became one of the company's most popular in its history.