Only a few hundred of this model was manufactured circa 1856 to 1864. It is very similar to the Full Stock Military Rifle and has a crescent shaped buttplate but no sling swivels. It can be identified by the full-stock forend, lack of bayonet lug on the barrel and use of sporting style sights.

The address on the top-strap reads "COLT'S PT / 1856 and ADDRESS COL COLT/HARTFORD CT. U.S.A.". It comes in .36, .40, .44, .50, and .56 calibers. All calibers have a six shot fluted cylinder except the .56 caliber which has a five shot fluted cylinder. The round barrel with semi-octagonal breech can be found in many lengths including 21, 24, 27, 30 and 31 5/16 inches.

There are some special variations with regards to trigger-guards, sights, frames, barrel length and caliber. There are some great examples of engraved and presentation pieces known.

The serial numbering for this model is rather complicated and it is advisable to check out specialist information to date these longarms and put them in the right category.

For in-depth reference on Colt Model 1855 Root Revolving rifles, carbines and shotguns see 'The Book of Colt Firearms- 3rd Edition' by R.L. Wilson or 'Colt Rifles & Muskets from 1847 to 1870' by Herbert G. Houze. For values, check out 'Flayderman's Guide to Antique American Firearms… and their values' by Norm Flayderman.