Colt .45

The Colt .45 was a projectile weapon popular in the 19th and 20th centuries. The .45 single action cavalry pistol was invented by Colt Firearms in 1873.

In 1893, Samuel Clemens owned a Colt .45 which was lost to time under San Francisco, only to be later discovered in the 24th century. 

In 2268, in the Melkotians reenactment of the Gunfight at the OK Corral, the entire landing party was given Colt .45s; however, they were never used, as they were given to them by people who were to execute them. The replicas of the Earp brothers also carried the same guns.