Mystic River is a 2003 mystery drama based on the Dennis Lehane novel and was directed by Clint Eastwood. The film stars Sean Penn, Kevin Bacon, and Tim Robbins as three men who are linked by a traumatic event while growing up in Boston and whose lives once again intersect when the daughter of one of them is found murdered. Both Sean Penn and Tim Robbins earned Academy Awards for their performances in the film.
The following guns were used in the film Mystic River:
Mr. Looney (Eli Wallach), the owner of Looney Liquors, shows an Ithaca 37 with the stock sawed off to Trooper Sean Devine (Kevin Bacon) and Sergeant Whitey Powers (Laurence Fishburne) when describing a robbery.
Smith & Wesson Model 10
In the film, the revolver identified as a ".38 Smith" by the police investigators is a Smith & Wesson Model 10. The revolver is said to have been used by "Just Ray" Harris in the robbery of Looney Liquors. Brendan Harris (Tom Guiry) shows an empty holster where the S&W had been. The revolver is also seen in the hands of "Silent Ray" (Spencer Treat Clark) and his friend John O'Shea (Andrew Mackin).
Being the standard weapon of the Massachusetts State Police, Sean Devine (Kevin Bacon) carries a SIG-Sauer P226 as his sidearm in the film. This is slightly off as the model in the film is shown to be the SA/DA (as noted by external hammer) as opposed the the current DAK model. He begins to unholster it when he and Sergeant Powers (Laurence Fishburne) burst into the Harris home and are confronted by a suspect holding a Smith & Wesson Model 10.
The re-enactors marching in a parade at the end of the film are seen holding Flintlock rifles likely in honor of the Revolutionary War, a commonly celebrated event in Boston.