From Internet Movie Firearms Database - Guns in Movies, TV and Video Games
Remington Model 11 "Whipit" gun - 12 gauge, a replica of a weapon used by the real-life Bonnie and Clyde (shown in the photo on the right).
Remington Model 11 "Whippet" gun - 12 gauge
Browning Auto-5 "Military model". This model used by British forces under L32A1 designation.
The Remington Model 11s recovered from the real-life John Dillinger's gang. Note how one has been sawed down.
Browning Auto-5 version for police use, with factory extended 8-round magazine - 12 gauge. It was also used by the army of Rhodesia during the Bush War.
Browning Auto-5, 23 1/2" slug barrel with Weaver K1 scope - 12 gauge