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 pistol. Both pistols approach the precision found on the Mark 23 by adding an extended threaded barrel with a rubber Oring adjustable trigger and adjustable targettype sights. The .45 ACP model of the USP Tactical is constructed on the USP45 frame. The 9 mm and .40 SW Tactical models are built on the USP 9mm40 caliber frame. The 9 mm variant known as the USP9 SD has a slightly different set of features.