The following weapons can be seen in the film Little Caesar:
Colt Model 1908 Vest Pocket
Joe Massara (Douglas Fairbanks Jr.) carries a .25 ACP Colt Model 1908 Vest Pocket that Olga (Glenda Farrell) discovers in his coat pocket.
Colt 1908 Vest Pocket Pistol - .25 ACP
Joe shows Olga his Colt Model 1908 Vest Pocket.
Colt Police Positive
Caesar Enrico "Rico" Bandello (Edward G. Robinson) carries a Colt Police Positive throughout the film.
Colt Police Positive - .38 Special
Rico listens as Flaherty questions Vettori's gang.
Rico threatens Joe and Olga.
Rico backs away from Joe.
Rico prepares to shoot it out with the police at the end.
Killer Peppi holds his Colt Police Positive revolver and an M1911 on Arnie Lorch.
Several of Rico's gang members, such as Scabby (Henry Sedley), Otero (George E. Stone), and Killer Peppi (Noel Madison) use M1911 pistols.
Scabby points his M1911 at the clerks during the nightclub robbery.
Otero holds two M1911s on Arnie Lorch's men.
Otero walks out, dual-wielding his M1911s.
Killer Peppi holds his Colt Official Police revolver and an M1911 on Arnie Lorch.
Colt Model 1903 Hammerless
One of Rico's men uses a Colt Model 1903 Hammerless during the New Year's Eve robbery. Sgt. Flaherty (Thomas E. Jackson) also carries one throughout the film.
Colt Model 1903 Pocket Hammerless pistol - .32 ACP
One of Rico's men holds his Colt Hammerless on Joe during the robbery.
Flaherty holds his Colt 1903 when arresting Vettori's gang.
One of Rico's gang holds a Thompson M1921 during the nightclub robbery on New Year's Eve. Sgt. Flaherty (Thomas E. Jackson) uses one to shoot at Rico during the finale.
Rico's men stand guard with a M1911 and a Thompson.
Flaherty takes aim with the Thompson.
Colt New Service
Killer Peppi (Noel Madison) uses a Colt New Service when he, Rico, and Otero kick Arnie Lorch out of the city.
Colt New Service - .45 Long Colt
Peppi sticks his Colt New Service through the doorway.