D.O.A. (aka Dead on Arrival) is a 1988 thriller that stars Dennis Quaid as Dexter Cornell, a college professor who has 36 hours to find out who poisoned him before he dies. The film is based on the 1950 film noir of the same name.
The following firearms can be seen in the film D.O.A.:
Cookie Fitwaring (Robin Johnson) uses the AMT Hardballer during a confrontation in her mother's stable. Bernard (Christopher Neame), the chauffeur of Mrs. Fitzwaring (Charlotte Rampling), takes it after Cookie drops it as she's drunk. Later, Dexter Cornell (Dennis Quaid) takes the gun and uses it for the remainder of the film.
Smith & Wesson Model 19
A police officer briefly wields a Smith & Wesson Model 19 revolver at Cornell's house, after Cornell takes a 'hostage'.
Colt Detective Special
Beretta Model 70
Heckler & Koch P7M13
In a brief continuity error, Mrs. Fitzwaring's gun turns into a Heckler & Koch P7M13 after being confronted by Dexter Cornell.