Dirty Harry novels of the four first "Dirty Harry" films as tie-ins. Author and screenwriter Phillip Rock wrote the novelization of "Dirty Harry" in 1971, based on an early draft of the script. Mel Valley wrote the sequel, "Magnum Force", in 1973. Wesley Morgan novelized "The Enforcer" in 1976. The "Sudden Impact" novelization was written by Joseph Stinson, one of the screenwriters. Stinson, who had rewritten the originally independent script as a "Dirty Harry" vehicle for Eastwood, adapted the novel in 1983. Following "The Enforcer", Eastwood announced that he would not make any further "Dirty Harry" films (he eventually returned to the role
Clint Eastwood in the 1970s feature gun shooting in practice, competition and on the job. Given this strong theme in the film, the title was soon changed to "Magnum Force" in deference to the .44 Magnum that Harry liked to use. Milius thought it was important to remind the audiences of the original film by incorporating the line "Do ya feel lucky?", repeated in the opening credits and with Dirty Harry once again eating a hamburger instead of a hot dog but this time foiling an airplane hijacking at the airport. With Milius committed to filming "Dillinger", Michael Cimino was later hired to revise the