The Kahr MK40 is the micro-compact all-steel .40 S&W, applying the MK9 formula to the .40 S&W caliber for pocket carry. Type: Pistol Action: Semi-Automatic Caliber: .40 S&W Capacity: 5 Year introduced: 2000, USA Weight: 25 oz Overall length: 5.47" Status: Active Intended use: Concealed Carry, Pocket .40