The UHC H&K USP pistol is an airsoft pistol made by UHC. It''s modeled after the pistol used in the famous videogame Tomb Raider, starring Lara Croft. The series spawned a movie series and a few very profitable games for the PC and home consoles. The gun itself is also a real-life weapon used by Heckler & Koch. The gun fires 6mm plastic BBs in a spring-action function. When pulling back the slide, the gun loads another BB. The gun is famous for the three ridges underneath the barrel of the gun. While the ridges may have some tactical function in some way, they are mostly for show and to make the gun appear more threatening.