Enhanced versions of the USP, the USP Tactical models are designed for users who need the features found on the HK Mark 23, but in a more compact and lighter weight pistol. USP Tactical pistols approach the precision found on the Mark 23 by adding an extended threaded barrel with a rubber O-ring, adjustable trigger, and adjustable target-type sights. The .45 ACP model of the USP Tactical is constructed on the USP45 frame. The 9 mm/.40 S&W Tactical models are built on the USP 9mm/.40 caliber frame. NOTE: The caliber .40 S&W USP Tactical model is currently unavailable.
Heckler & Koch GmbH (HK) (German pronunciation: [ˌhɛklɐ ʔʊnt ˈkɔx]) is a German defense manufacturing company that manufactures handguns, assault rifles, submachine guns, and grenade launchers. The company is located in Oberndorf in the state of Baden-Württemberg, and also has subsidiaries in the United Kingdom, France and the United States.