The following guns were used in the film True Grit:
Colt Single Action Army
Marshall Reuben J. "Rooster" Cogburn (John Wayne) keeps a Colt Single Action Army or "Peacemaker" with a 4 3/4" barrel, known as the "Quick Draw" model as his sidearm of choice throughout the film. "Lucky" Ned Pepper (Robert Duvall) also keeps a Quick Draw Peacemaker which he uses when facing Rooster during the film's climax. While watching Rooster load his Peacemaker, Mattie Ross (Kim Darby) asks him why he keeps one chamber empty, to which he replies, "So I won't shoot my foot off." At one point in the film, Rooster tells Mattie about how when he was in the Civil War, he did the same dual wielding guns method while on horseback, which he claims he fired two "Navy '60s" with the reins in his mouth, despite the fact that the Colt 1860 was the Army revolver, not the Navy. The 1851 and 1861 models were the Navy guns.
Winchester 1892 "Saddle Ring Carbine"
Rooster Cogburn (John Wayne) keeps a Winchester 1892 "Saddle Ring Carbine" with a large lever loop chambered in .44-40 as his rifle of choice throughout the film and is most notabley seen using it during the film's climax when he fires it akimbo style along with his Single Action Army, twirling the rifle with the large lever loop to cock it with one hand. (This action most likely inspired the same technique used by Arnold Schwarzenegger with the Winchester Model 1887 shotgun in T2).