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If you mean what's the difference between the 1895 and 1894, yes it is caliber basically. The 1895 is built for the .45-70 while the 1894 is built for pistol-sized cartridges, i.e. the .44 mag and the .357 mag.. These are the newer 1894s and 1895s. The original 1894s and 1895s were produced in the 19th century in many different calibers. For quite a bit of information on most any Mariln firearm or anythin made by one of the varitaions of the Marlin Company see the book Marlin Firearms by William Brophy