Insomnia is a 2002 thriller starring Al Pacino as Will Dormer, a sleep-deprived LAPD detective who travels to Alaska to investigate a murder in a small town. The film co-stars Robin Williams as Walter Finch, a novelist who could provide the key to solving the murder, and Hilary Swank as Ellie Burr, a young Alaskan police officer who looks to Dormer for guidance. The film was directed by Christopher Nolan and is a remake of the 1997 Norwegian film of the same name.
The following weapons were used in the film Insomnia:
Smith & Wesson 4505
The Smith & Wesson 4505 is the primary sidearm of LAPD Detectives Will Dormer (Al Pacino) and Hap Eckhart (Martin Donovan). Coincidentally, this rare 4506 variant (only 1200 units made in 1991) also happened to be the sidearm carried by Robert De Niro (the actor often compared to Al Pacino), who in the same year as this film, portrayed an aging LAPD veteran detective in the film Showtime. This pistol is also seen in the hands of Det. Ellie Burr (Hilary Swank).
Dormer (Al Pacino) also carries a Walther PPK/S as a backup weapon. He keeps it in the three o'clock position in a back holster. In the film it is referred to as being a 9mm, which, while generally referring to the 9x19mm (which would be incorrect) it would still be technically correct if it is chambered in .380ACP, known as the German 9mm Kurz or 9mm short (9x17mm).
Smith & Wesson Model 10
Walter Finch (Robin Williams) keeps a Smith & Wesson Model 10, .38 Special that once belonged to his uncle. Detective Farrell (Larry Holden) is shot in the leg with one in the beachfront scene. Dormer finds it and later uses it to try and frame Finch for shooting his partner Hap Eckhart. However, Finch outsmarts Dormer and passes the frame on to Randy Stetz (Jonathan Jackson).
Second-generation Glock 23 handguns are carried by several Nightmute police officers including Ellie Burr (Hilary Swank). In their discussion of the recovered 9mm shell casing, Ellie mentions that "none of us carries a 9mm weapon or a backup weapon," which means that they are likely carrying .40 caliber Glocks. Finch is seen later holding one.