You may already have this information but in 1861 the 26th Kentucky Volunteer Inf.(US) was armed with the Colt Revolving Rifles. The was Col. Burbridge's regiment. His regiment used the weapons effectively in several skirmishes in Southern KY in 1861.
The Battle of Whippoorwill Bridge
The Battle of Woodbury
The Battle of Morgantown
The Battle of Big Hill