The Lookout (French title: Le Guetteur) is a 2012 French crime drama directed by Michele Placido. The film is about a relentless Police officer (Daniel Auteuil) who struggles to take down a high-end gang of bank robbers led by a former Secret-operations' marksman (Mathieu Kassovitz).
This is Mattei's (Daniel Auteuil) weapon of choice. Most of the other Police officers are using it too. The SIG SP 2022 became the official French National Police service handgun in 2003, succeeding to the PAMAS G1. It is most notably seen in the opening sequence, during the bank-robbery.
A RAID member is seen using a SIG Pro SP2009. The RAID is the tactical unit of the French National Police, specialized in Domestic counter-terrorism and law enforcement.
This is David's (Jérôme Pouly) sidearm and Vincent's main weapon after the bank shooting. However, there seems to be a continuity error: Vincent uses an earlier version of the SIG-Sauer P226 (without any rail) when he threatens Franck (Olivier Gourmet). A few minutes later, he is seen holding a more recent version of the gun, with a Picatinny rail.
Meyer (Nicolas Briançon) carries a Glock 17 as his weapon of choice. Judging by the aspect of the gun and the absence of a rail, it seems to be a "Second Generation" model.
Two Police officers are using Heckler & Koch MP5A3s during the shooting at the bank. The gun features an UMP folding stock and a tactical handguard with MIT rails.
David (Jérôme Pouly) seems to be using the 5.56x45mm model of the Romanian AIMR during the bank-robbery. It's a realistic weapon choice since most of the assault rifles used in crime operations in France are Eastern-european copies of AK type rifles.
During the opening bank-robbery shootout, Vincent (Mathieu Kassovitz) uses a French PGM Ultima Ratio as his weapon of choice. The rifle is chambered in .308 Winchester and fed with a 10-round detachable box magazine. In this scene, Vincent deliberatly wounds the police officers instead of killing them. Besides the dramatic effect, this shows that his degree of skill and training is clearly above than that of an average bank robber. It's an appropriate rifle for a former top-level military assassin.
Toward the end of the film, Mattei gets a hold of a SIG SG 550 SR fitted with a folding bipod and an adjutable sniper buttstock. Its previous owner fired it full auto, but Mattei fires it semi-auto (probably not to hit any civilian).