The Z45 was a submachine gun designed during World War Two by the Start firm in Eibar, Spain for export sale to Germany as well as domestic Spanish use. It was heavily based on the MP40, including the same stock, telescoping mainspring guide/cover, and disassembly method as the MP40. To this, however, Star engineers added a progressive type trigger mechanism, a detachable barrel, and a moving firing pin to improve safety. No sales were actually made to Germany, but the gun was adopted by a variety of Spanish military and security organizations in 9mm Largo and also sold for export in 9mm Parabellum, .38 ACP, and .45 ACP. It remained in production into the early 1960s, when it was replaced by Star’s new Z62 submachine gun.