One eine uno ichi um bier un model 1898 Krag jorgensen small (back or rear) rear sight screw,same screw for the model 1896 and 1899 carbines,any model of rear sight,also same screw for the model 1873 trapdoor rear sight,see my other listings for more Krag model 1898,1896,1899 rifle and carbine, parts and accessories