Caliber 9 was released in the year 1972。Caliber 9 is also called as Milano calibro 9, Milano kaliberi 9, Milano Kaliber 9, Milan calibre 9, calibre 9, Milán, Kaliber 9。

Just out of prison, ex-con Ugo Piazza meets his former employer, a psychopathic gangster Rocco who enjoys sick violence and torture. Both the gangsters and the police believe Ugo has hidden $300,000 that should have gone to an American drug syndicate boss.