Raiders of the Lost Ark

The following guns can be seen in Raiders of the Lost Ark:

RPG-2

Near the climax of the film, Indiana Jones (Harrison Ford) points a shoulder-fired anti-tank weapon at the ark while it is being transported by the Nazis and threatens to blow it up. The weapon is actually a Chinese Type 56 copy of the Soviet RPG-2 made to look like a WWII-era German anti-tank weapon (it features a Panzerschreck-style shoulder grip). Since neither the Panzerschreck nor the Panzerfaust existed in 1936 (when the movie takes place), he should not have a weapon like this.

RPG-2

Indiana Jones with the "German" RPG-2.

Another view of Indy pointing his RPG-2.

Nordenfelt gun

A twin barrel Nordenfelt gun is seen mounted at the rear turret of the 'Flying Wing' plane.

MP40

File:Maschinenpistole MP40.jpg

MP40 9mm

Many of the Nazis use MP40 submachine guns in this movie, which is not appropriate since the film is set in 1936 and neither the MP40 nor its more expensive predecessor, the MP38, existed at the time.

Mauser C96

File:Mauserc96.jpg

Mauser C96 "Broomhandle"

Famous 'Broomhandle' pistol of 7.63mm or 9mm calibre with a 10 round magazine. Historically accurate as developed in the 1890's and used by Marion (Karen Allen) to shoot the last Nepalese Nazi Stooge on the bar brawl.

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Luger P-08

File:DWM 4 inch Navy Luger 859.jpg

Luger P08 9mm

Equally famous 9mm 8 round pistol developed in the late 1890s and adopted by the German Army in 1908. Used by various baddies in the film & again historically accurate

Mauser Karabiner 98

Karabiner 98k - German manufacture 1937 date - 7.92x57mm

Bolt action rifle used by German Soldiers and Egyptian henchmen in the film. The 98K "Karabiner" was began manufacture in 1935 so it is conceivable that it would be out of the country by 1936, however the German soldiers would be more likely be carrying Gewehr 98s.

MG 38

Belt fed machine gun seen mounted on various Nazi vehicles in the film (with optional 50 round 'snail' type magazines). An anachronism as not developed until 1938

Browning Hi Power

Indy's alternate handgun is the 9mm Browning Hi Power.Used in the bar scene and later aboard Katangas ship.

Smith and Wesson Hand Ejector Model 2

 Indy used two of them in the movie on was A .45 acp and the other 

was chambered for the .455 elley(A British round).The .45 is the one he hands over to Belloq in the beginning of the film.He uses the other throughout the rest of the film.Both guns have barrels cut down to 4.

Walther P38

Used by various Nazis throughout the film. A 9mm Parabellum 8 round pistol not produced until 1938 and as such an anachronism in the film.