Infernal Affairs is a 2002 Hong Kong crime thriller that focuses on two Hong Kong police inspectors, one who was recruited to go deep undercover into the Triad organization and one who was recruited by the Triads to be a mole in the police force. The film stars Andy Lau (who co-directed the film) and Tony Leung and would spawn two sequels. The film was subsequently remade by Martin Scorsese into the 2006 film The Departed.
The following weapons were seen in the film Infernal Affairs:
Third Generation Colt Detective Special revolvers are the primary weapon of the Hong Kong Police Force Crime and Security Department officers in the film. Inspector Lau Kin-Ming (Andy Lau) is armed with this revolver at the end of the film before being disarmed by Chan Wing-Yan (Tony Leung).
Smith & Wesson Model 10 revolvers are the primary side arm of uniformed officers of the Hong Kong Police Force. The weapon is seen at the end of the film when Inspector Lau leaves the elevator to awaiting uniformed personnel. It seems as though some officers carry the standard version of the Model 10 while others are equipped with the heavy barreled variant.
Colt Trooper Mk III
A Colt Trooper Mk III is seen in the hands of a police officer in the lobby.
Glock 17
Chan Wing-Yan (Tony Leung) uses a second generation Glock 17 in the final scene when he holds Inspector Lau Kin-Ming (Andy Lau) hostage on the roof top. A well known goof to the audience is when Yan draws his Glock on Lau, it clearly has no magazine, but in later shots his Glock has a magazine.
Taurus PT92
Taurus PT92 pistols are used by triads throughout the film, notably in the shootout immediately following Superintendent Wong's (Anthony Wong) murder.