This Springfield Armory manufactured sear screw measures .670" in length and is for the model 1873 trapdoor rifle and carbine in 45-70 Govt. caliber. This screw is in very good condition exhibiting a grayish brown patina with light slot wear. (file photo)
Note: U.S. Springfield Armory trapdoor rifles with the following serial numbers have been observed with this part: 109668, 130964 & 325489
