The Heckler and Koch 81000349 is an improved version of the USP models, mirroring the features of the HK Mark 23 but in a more compact size, catering to users who prefer a more portable pistol. It brings you a step closer to the Mark 23 precision by equipping an extended threaded barrel with a rubber O-ring, an adjustable trigger, and adjustable target-type sights.The USP Tactical model in .45 ACP is built upon the USP45 frame, whereas the 9mm and .40 S&W Tactical variants are built on the USP 9mm/40 caliber frame. Please note that the USP9 SD, the 9mm variant, sports a slightly different suite of features. It does not come with an o-ring barrel, a match trigger, and an adjustable trigger stop. This firearm comes with two 10rd magazines included.