The Smith & Wesson Model 686 is a six- or seven-shot double-action revolver manufactured by Smith & Wesson and chambered for the .357 Magnum cartridge. It will 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.