This original 26.5 inch 45-70 caliber Barrel & Receiver # 506800. It has a mix of smooth brown patina and original bluing. The rear sight mounting screws and tang threads are in excellent condition. The bore is bright and shiny with deep rifling. This can be used to build a nice carbine or custom rifle. It will fit all Models including 1873, 1877, 1878, 1879 & 1884.