Doc Holliday, portrayed by Val Kilmer, carries a Colt Thunderer with birdshead grips, and a 3 1/2" barrel.
Belgian Meteor 10 Gauge side-by-side
True to the real Doc Holliday's preferences Val Kilmer uses a Belgian Made "Meteor" 10 Gauge side-by-side shotgun in the shootout at the OK Corral.
Stevens 10 Gauge side by side
During the shootout at Iron Springs, Wyatt Earp (Kurt Russell) is armed with a three triggered Stevens 10 Gauge double barrel.
Whitney Kennedy .44-40
During the "Vendetta" ride Texas Jack Vermilion was armed with a Whitney Kennedy .44-40.
1876 Winchester .45-60
According to Peter Sherayko(the armorer and who portrayed "Texas Jack" in the film) there were five Winchester Model 1876 rifles chambered in .45-60 that were used in the film. Most notably they were carried by Johnny Ringo (Michael Biehn), Breckenridge (Jason Priestly) and Sherm McMasters (Michael Rooker).
Evans Rifle
Pony Deal(a Cowboy gang member) was armed with a 28 shot Evans rifle manufactured in the 1870's by Evans of Maine.
Colt Buntline Special
Wyatt Earp carries a Colt Buntline Special. Russel used an EMF/Uberti replica made specifically for the film with a 10" barrel.
S&W Schofield revolver
Virgil Earp (Sam Elliot) carries a S&W Schofield revolver.