Buddy (Sid Haig) and Purvis (David Arquette) both carry Remington 1890 pistols in the opening of the film, distinguishable primary by their lanyard rings on the butt.
Single Action Army
As with many Westerns, the Single Action Army is the most commonly seen gun in the film, in the hands (or holsters) of nearly every major and minor character.
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Smith & Wesson Schofield
Doc Holliday (Val Kilmer) keeps a nickel Colt Lightning as a second sidearm, in addition to his Quickdraw SAA. Note the bird's head grip.
Billy Clanton (Thomas Haden Church) loads a 12 Gauge Double Barreled Shotgun during the film's opening shootout with the Cowboys. Several others can be seen throughout the film, used primarily by other Cowboys such as Florentino Cruz (Paul Ben-Victor) in Tombstone, Ike Clanton (Stephen Lang) at the train station and "Curly Bill" Brocius (Powers Boothe) during the Iron Springs shootout. Sherm McMasters (Michael Rooker) also carries a 12 Gauge Double Barreled Shotgun as he arrives at the train depot with Doc Holliday, Texas Jack, and Turkey Creek Johnson.
Meteor 10 gauge side-by-side shotgun
Johnny "Madcap" Tyler (Billy Bob Thornton), the faro dealer, approaches Wyatt with a Belgian-made Meteor 10-gauge side-by-side shotgun, which Virgil Earp (Sam Elliott) picks up and uses after Johnny puts it down. Morgan Earp (Bill Paxton) also is seen carrying it. Wyatt Earp (Kurt Russell) uses the sawed-off 10-gauge as his backup gun, hidden underneath the faro table at the Oriental, when Johnny Ringo harasses Doc Holliday (Val Kilmer). Doc himself carries one into the O.K. Corral during the confrontation, as the true Doc Holliday had in 1881. Doc's real-life personal shotgun was a 10 gauge Colt double.
Stevens 10 gauge side-by-side shotgun
Wyatt Earp (Kurt Russell) carries a three-triggered Stevens 10-Gauge shotgun during his vendetta ride, notably using it to kill Frank Stilwell (Tomas Arana) at the train depot and "Curly Bill" Brocius at Iron Springs.
Several Cowboys use Winchester Model 1876 rifles during the film, including Johnny Ringo (Michael Biehn) and Breckenridge (Jason Priestley). Of Earp's men, Sherm McMasters (Michael Rooker) and "Texas Jack" Vermillion (Peter Sherayko) also carry Winchester '76 rifles. According to Sherayko, who was also the film's armorer, there were five Winchester Model 1876 rifles, chambered in .45-60, used in the film.
Kentucky Flintlock Rifle
When Virgil, as Deputy Marshal, posts the notice banning the carry of guns within the town of Tombstone, a man can be seen holding what appears to be a Kentucky Flintlock Rifle in protest.