Clyde Barrow (Warren Beatty) shows off his Smith & Wesson Model 10 early in the film to impress Bonnie Parker (Faye Dunaway). She also uses one with pearl grips later during the bank robberies. Clyde also gives one to the sharecropper and his helper, Davis, to fire at their repossessed house when Bonnie tells them "We rob banks." Buck (Gene Hackman) and C.W. Moss (Michael J. Pollard) each briefly use one to subdue Frank Hamer. Several policemen also use Model 10s during the course of the film.
Colt New Service
Clyde Barrow (Warren Beatty) is seen using a Colt New Service multiple times, most notably while robbing the grocery store and when shooting the gun from Frank Hamer's hand. Early in the movie, Bonnie (Faye Dunaway) uses one to shoot bottles off a fence. Frank Hamer (Denver Pyle) himself carries a New Service as a Texas Ranger. Buck Barrow (Gene Hackman) carries a New Service during a bank robbery and the Platte City shootout.
Colt Police Positive
Several Joplin police officers use Colt Police Positive revolvers during the shootout. Bonnie Parker (Faye Dunaway) also uses one occasionally. When C.W. Moss (Michael J. Pollard) is buying food for the gang, a Platte City policeman sees the Colt Police Positive stuck in his pants and calls the sheriff.
Colt M1911A1
Clyde Barrow (Warren Beatty) uses a Colt M1911A1 during the gang's biggest bank robbery. He does not fire it.
Submchine Guns
Thompson M1928
A Thompson M1928 is used by the Barrow Gang during the Platte City motor court shootout by Clyde (Warren Beatty), Bonnie (Faye Dunaway), and C.W. Moss (Michael J. Pollard). Frank Hamer (Denver Pyle) and his deputies also use Thompsons when mowing down Bonnie and Clyde in the finale. (The movie depicts this firearm being the Barrow Gang's weapon of choice, but the real Clyde preferred the Browning Automatic Rifle to the Thompson; a weapon he acquired by breaking into a National Guard armoury).
Rifles
Winchester Model 1892
A police officer in Joplin and a vigilante in Iowa use Winchester Model 1892 rifles.
Shotguns
Winchester Model 1897
A Joplin police officer fires a Winchester Model 1897 at the Barrow Gang as they escape the shootout.