These original, excellent condition, 3 Notch tumblers with stirrup will fit and function perfect in any Springfield 45-70 Trapdoor. They were initially used on the Model 1878 and replaced the 2 notch tumblers. They will fit all Models including 1873, 1877, 1878, 1879, 1884, 1888 Springfield Carbines, Rifles and Cadets. If you are a shooter they are a necessity to have as a spare. Use ORI-345 Model 1873 Three Notch Sear with this tumbler.