The Departed is a 2006 American crime thriller film directed by Martin Scorsese and stars Leonardo DiCaprio, Matt Damon, Alec Baldwin, Martin Sheen, Mark Wahlberg, and Jack Nicholson. The film is a remake of the 2002 Hong Kong crime thriller film Infernal Affairs and went on to receive 5 Academy Award nominations and would receive 4, including the Awards for Best Picture and Best Director (the first for director Scorsese).
The following weapons were used in the film The Departed:
The SIG-Sauer P226 is carried by all of Massachusetts State Police (MSP) officers in the film, including Sergeant Colin Sullivan (Matt Damon), Detective Brown (Anthony Anderson), Staff Sergeant Sean Dignam (Mark Wahlberg) and numerous other characters.
Note: In real life, the P226 has been standard-issue for the MSP members since 1987. However, during the scene where Colin is sitting in a class on ballistics while at the academy, the instructor mentions that the department's service pistols are chambered for 9mm hollow-point rounds. This is a slight inaccuracy, the MSP have been using the .40 S&W version of the P226 since the mid-1990s (and more recently switched to the double-action-only DAK model, whereas the guns in the film are SA/DA models).
In some scenes, the SIG-Sauer P228 is carried by Sergeant Colin Sullivan (Matt Damon). While the above screencaps all show what appear to be P226 pistols rather than P228s, it is possible P228s were also used as standby guns.
Note: A stated-as-verified screen-used SIG-Sauer P228 used by Matt Damon is currently on display at the National Firearms Museum located at the NRA Headquarters in Fairfax, Virginia.
Although the SIG-Sauer P226 is standard-issue for the Massachusetts State Police (both in the film and in real life), but a close-up of Colin Sullivan (Matt Damon) firing his weapon at the academy reveals an Astra A-100. This pistol looks similar to the SIG-Sauer pistols, but it is a very different weapon. When Billy Costigan (Leonardo DiCaprio) is seen training on firearms at the academy, he also seems to be using this same pistol (probably the same prop gun).
Billy Costigan (Leonardo DiCaprio) carries a flat nickel Walther PPK as his sidearm throughout the film. Later this weapon is used by Trooper Barrigan (James Badge Dale) and then eventually by Colin Sullivan (Matt Damon).
Beretta 84 Cheetah
Frank Costello (Jack Nicholson) carries a Beretta 84 Cheetah (the early model) as his sidearm throughout the film. It is seen most notably when he confronts Billy about the possibility that Billy might be an informant.
Arnold French (Ray Winstone) carries a Colt Python (snub nose model) throughout the film. It is seen most notably during the warehouse scene, when he cocks the weapon while it's concealed behind his back.
Smith & Wesson Model 19 Snub Nose
Smith & Wesson Model 36
Heckler & Koch MP5A3
During the warehouse scene, one of Chinese thugs carries a Heckler & Koch MP5A3 fitted with a Surefire dedicated forend (but with no flashlight in the grip).
Two of Chinese thugs are seen carrying Cobray M11/9 submachine guns during the money exchange in the warehouse.
Near the end of the film, two of Costello's men are seen firing MAC-10 submachine guns at the Massachusetts State Police, despite Costello's earlier statement that his men don't carry machine guns.
A Franchi SPAS-12 shotgun with a fixed stock is used by one of Costello's men during a shootout near the end of the film.
Mossberg 500 Cruiser
A Mossberg 500 Cruiser is used by Timothy Delahunt (Mark Rolston) during a shootout with Internal Investigations detectives. Another Mossberg 500 Cruiser is also seen when Costello's men clear out of a room after being tipped off about a police raid.
One of Massachusetts State Police officers is seen firing an Ithaca 37 shotgun at Costello's men during the final shootout. It is equipped with an extended magazine tube. Costello's thugs also point their Ithaca 37s at the backs of Chinese thugs.
Rifles / Carbines
Olympic Arms K23B
Olympic Arms K23Bs, Canadian-made ultra-compact Colt Carbine variants with 6.5 inch barrels, are used by several Boston Police Special Operations Unit officers when they take down Costello's thugs near the end of the film.