Total produced about 14,182. Same as the 1842 U.S. Percussion Musket, but features a 69 caliber rifled barrel. Slightly more than 10,000 were fitted with long range sights, the balance were issued without them. Model 1855 U.S. Percussion Rifle-Musket. Front sight doubles as lug for angular bayonet.
Early models have long range rear sight, later models have two leaf rear sight.
Three barrel bands retained with barrel band retaining springs. Steel ramrod with tulip shaped end and swelled shank at forend cap. Metal parts finished bright. Lock contains a Maynard primer system. Staple arm of the civil war.