Unlike the German version, the Z-45 is a selective fire weapon (full-auto or single shot).

[4] The Z-45 had a fluted chamber to ease extraction with the powerful 9×23mm Largo cartridge.

[6] Versions chambered in 9×19mm Parabellum, .38 Super and .45 ACP were also produced, since the barrel can be easily removed.

[3] The Star Z-45 was adopted by the Guardia Civil in 1945, by the Spanish Police the next year, by the Air Force in 1947 and eventually by the Army in 1948.

[7] It was used in combat during the Ifni War against the Moroccan Army of Liberation.