The HK MP5 submachine gun, developed by Heckler & Koch, is a lightweight, air-cooled, selective fire delayed blowback with a roller-delayed bolt weapon, which fires from a closed bolt position. This Navy SEALs weapon uses a 9×19mm Parabellum cartridge, 15 and 30 round capacity magazines. Its sighting arrangement consists of aligning concentric circles and mechanically [...]