When back in France, Joss Beaumont (Jean-Paul Belmondo) uses a Colt Python revolver with 6" barrel as his main sidearm.
Arminius HW-3
Police commissioner Rosen (Robert Hossein) carries an Arminius HW-3 revolver. It appears to be a version in .32 S&W Long. Rosen's subordinates, including Inspector Farges (Bernard-Pierre Donnadieu), are also seen with similar looking revolvers.
Unidentified revolver
President N'Jala's bodyguard carries a revolver in holster. Only the grip can be seen. Maybe it's a snub nose Colt Python but it's only a guess.
Pistols
M1911A1
After Inspector Farges (Bernard-Pierre Donnadieu) looses his Arminius HW-3 to Joss Beaumont, he arms himself with an M1911A1 pistols. In the final scene some other police inspectors also carry M1911A1 pistols. President N'Jala (Pierre Saintons) tries to grab a pistol, that appears to be an M1911A1, from his desk's drawer during the film's climax.
Star Model CU
Alice Ancelin (Cyrielle Clair) keeps a small automatic in her nightstand. It appears to be a Star Model CU with chromed slide and black anodized frame.
Unidentified pistols
Submachine Guns
MAT-49
Most of the Malagawian soldiers use MAT-49 SMGs during the raid on the village. MAT-49s are also carried by French gendarmes.
MP40
What appears to be an MP40 is seen in hands of a Malagawian soldier.
Thompson
What appears to be some version of Thompson is seen in hands of a Malagawian soldier.
Numerous French gendarmes are armed with MAS-36/51 rifles.
Assault Rifles
Armalite AR-10 Assault Rifle
The Armalite AR-10 with sniper scope was hiden by Joss Beaumont (Jean-Paul Belmondo) in an Malagawian village prior to the events of the film. Beaumont uses it to great effect during the firefight with government troops.
Many Malagawian soldiers and prison guards are armed with Sturmgewehr 44 assault rifles.
Machine Guns
Browning M1919A4
Browning M1919A4 machine guns are seen mounted on jeep in several scenes.
Browning M1917
A jeep mounted Browning M1917 is seen briefly in the background during Joss' fight with the prison guards.
Other Weapons
Flamethrower
A flamethrower of unknown model is used by a Malagawian soldier to incinerate some of the huts in the village. It looks more like a real weapon than a movie prop.
Tromblon Mle F3 Smoke Grenade Launcher
A MAS-36/51 rifle with a Tromblon Mle F3 smoke grenade launcher is seen in hands of a gendarme.