After escaping Atlanta, Rhett Butler (Clark Gable) leaves Scarlett (Vivian Leigh) on her own so he can go fight in the war, before leaving, he gives Scarlett a Remington 1858 Revolver, which she later uses to shoot a Union soldier in the face.
Colt Model 1860 Army Percussion
The Yankee deserter (Paul Hurst) that attempts to steal from Scarlett's house is seen wielding a Colt 1860 Army, which was the Union Army's general issue revolver. Scarlett is also seen using one later on while trying to defend herself from a couple of homeless guys.
Unknown Revolver
Ashley Wilkes (Leslie Howard) comes down the stairs before leaving to fight, a revolver that is hard to identify is seen holstered on his hip, more than likely it is a Remington 1858, seeing as it was the most common revolver issued to Confederate Troops.
Springfield 1861 Rifle
The film takes place during the Civil War, so many soldiers are seen with Springfield 1861 rifles