Les Morfalous (literally The Greedy-Guts, in French argot) is a 1984 French action-comedy movie by Henri Verneuil starring Jean-Paul Belmondo, featuring the French Foreign Legion during the Second World War.
The following guns were used in the movie Les Morfalous
When the German soldiers attacked the French legionnaires, they are using MG34 machine guns.
Browning M1919 (mockups)
Browning M1919 machine guns are seen mounted on the trucks in the opening scene. They are not genuine M1919s and most likely are mockups (the flash hider is not the one from an M1919A6 or a .303 Mk II, it has barrel mounted front and rear sights, the barrel cover has elongated holes, the receiver is generally an odd shape and the pistol grip/buffer tube looks like it attaches too high on the back plate). In addition these guns have never fired in the movie.
Other
Model 24 Stielhandgranate
When legionaries dress German uniform, Sgt. Pierre Augagneur (Jean-Paul Belmondo) took Model 24 Stielhandgranate but never used it.
Flare Pistol
A flare pistol is used by Germans.
Rocket Launcher
A rocker launcher is seen in hands of French soldiers in the final scene. It is a little blurry and hard to identify. Due to its size it can be M20 "Super Bazooka" or RL-83 Blindicide or some other launcher.
Trivia
SK-105 Kürassier Light Tank
Austrian SK-105 Kürassier light tank (produced in 1970s) acts as a German tank.
Panhard AML 90 Armoured Car
French Panhard AML 90 armoured car (produced in 1960s) acts as a German armoured car.