Cimarron Firearms is an American firearms importer that has been in operation since 1984.  Leonard Frank Allen had started Replica Arms, El Paso, Texas in 1962, with the first Colt 1847 Army replica, made by Armi San Marco. In 1965 he sold Replica Arms and relocated to Santa Fe, New Mexico. Allen then started Western Arms and found himself the subject of a lawsuit brought on by Winchester as "Western Arms" was the name of their ammunition company. Allen renamed the company using his surname.  In 1985, Allen was forced to close Western Arms and sold the stock to Mike Harvey of Houston TX.

Cimarron Firearms began in 1977 as a muzzle loading shop and sporting goods store in Houston, Texas, known as "Bigfoot". Mike Harvey, who owned the shop, ordered plans for a Hawken rifle from a museum and built his first replica from scratch. As the economy worsened due to the early 1980s oil depression in Texas, Harvey sought to diversify his stock by selling replica old-west firearms. By 1985 he aquired stock from the defunct Allen Arms importing Uberti revolvers from Italy.

Today, Cimarron maintains a retail shop that specializes in period clothing, accessories and Cimarron firearms known as Texas Jack's Wild West Outfitters, named for Texas Jack Omohundro, as Harvey owns several of his firearms. The shop caters primarily to the film industry and replica revolver shooters.