Model Variants (Including Prototypes)
Joslyn Rifle - Base Series Name
Model 1855 - Model of 1855; initial offering in .54 caliber; paper cartridge and percussion cap action.
Model 1861 - Model of 1861; .58 caliber issued to U.S. Army forces.
Model 1862 - Model of 1862; improved model carbine; metal rimfire cartridge support; firing pin enabled.
Model 1864 - Model of 1864; carbine model with improvements.
Model 1865 - Model of 1865; based on the Model 1864 with refinements.