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Smith & Wesson Model 29 revolvers used in the Dirty Harry series of films can be seen in two barrel lengths. The 8 3/8" barrel and the 6 1/2" barrel were used in the movies even though the original script for Dirty Harry specifies a 4" barrel which didn't seem to be available at the time.Smith & Wesson Model 29 revolvers used in the Dirty Harry series of films can be seen in two barrel lengths. The 8 3/8" barrel and the 6 1/2" barrel were used in the movies even though the original script for Dirty Harry specifies a 4" barrel which didn't seem to be available at the time. However, the primary Smith & Wesson .44 Magnum that Inspector Calahan carried was the 6 1/2" blued model purchased from Smith & Wesson Sales Representative Kelly Lookabaugh. * Dirty Harry carried a blued Smith & Wesson Model 29 .44 Magnum revolver with a 6 1/2" barrel.