 Based on the Sidehammer design, Colt produced the Sidehammer Model 1855 rifles and carbines for military and sporting use, as well as a revolving shotgun.In failing health, Colt expanded his factory on the eve of the Civil War, and began production of a new, lightweight .44 caliber Army revolver, followed a year later by a .36 caliber Navy version.This was produced in a rifle version as well as a shortened carbine.