The Dan Wesson Mayhem .40 S&W is a usa-made semi-automatic pistol chambered in .40 S&W, introduced in 2012. Primary use: self_defense, sport. Type: Pistol Action: Semi-Automatic Caliber: .40 S&W Capacity: 13 Year introduced: 2012, USA Weight: 38 oz Overall length: 8.7" Status: Active Intended use: self_defense, sport