The following firearms were used in the movie Casablanca:
Colt Model 1903/1908
Rick Blaine (Humphrey Bogart) carries a Colt 1903 .32 ACP in the movie. This is not the same gun as found on the promotional poster. As Humphrey Bogart was a man of smaller stature, he lobbied to have a smaller gun in close ups.
Harrington & Richardson Revolvers
Ilsa Lund (Ingrid Bergman) is seen toward the end of the film using a Harrington & Richardson 32 DA Top-Break Hammerless revolver. The top-break design is evidenced by the pin in front of the trigger guard.
Colt Pocket Positive
The Lebel Model 1886 Rifle is seen early in the movie and carried by the Moroccan Police/Soldiers who would have been armored by the French. The Lebel 1886 was sold extensively in French colonies at the turn of the century and early into the 20th century.