The infamous rifle allegedly used by Oswald is the Carcano M91/38. In several flashbacks, it's seen fired not only by Lee Harvey Oswald (Gary Oldman), but a fake Oswald (Frank Whaley) as well. Both Lou Ivan (Jay O. Sanders) and Jim Garrison are seen holding it while sitting in the depository window.
The Cuban rebels who are trained by the CIA are seen carrying M1903 Springfield rifles during their drills. Lee Harvey Oswald appears to be cleaning a disassembled Springfield when he's greeted by Willie O'Keefe (Kevin Bacon).
During Garrison's explanation of the assassination, a killer's team "ACME" uses what appears to be a M1903A1 Springfield with Unertl 8x scope to fire at the President.
The M1911A1 is seen on a dresser in the apartment of David Ferrie (Joe Pesci). When Garrison explains a theory regarding the shooting of Officer J.D. Tippit, a gunman is seen using what appears to be an M1911A1 on the Dallas policeman.
Jack Ruby (Brian Doyle-Murray) uses what appears to be a Colt Cobra to assassinate Lee Harvey Oswald (Gary Oldman). The Colt Cobra was the revolver used by the real Ruby.
As Garrison explains the government's theory of how a police officer was murdered, Lee Harvey Oswald (Gary Oldman) is seen using what appears to be a Colt Detective Special to murder Officer J.D. Tippit. In reality, Oswald was said to have used a Smith & Wesson Victory Model revolver he got through mail-order from a magazine. A federal agent raiding a rebel training camp also carries the revolver.
A Smith & Wesson Military & Police appears to be the revolver carried by officers of the Dallas Police Department. Officer Baker is seen pulling his revolver when confronting Oswald at the Book Depository. Officer Tippit appears to be pull this revolver when confronted by Oswald.
Lou Ivan (Jay O. Sanders) appears to be carry a Smith & Wesson Model 36 in his hip holster while speaking with Garrison at the beginning of the film about Oswald's Carcano.
