This is an exceptional example of a rare U.S. Springfield Model 1880 "triangular" ram-rod bayonet rifle. These were produced between the serial numbers of 154,000-158,000, circa 1880/81 with this example being numbered "154466". This series of rifle was similar to the Model 1879 and was the first to use the experimental sliding bayonet, of which 1,000 were produced. This configuration ultimately proved to be another failed Ordnance design with almost all being converted back into the standard rifle configuration. These rifles are similar to the model 1879 and have the wider/thicker receiver with improved gas ports, Model 1879 rear sight, that is adjustable for both elevation and windage, correctly stamped with a letter "R" for rifle on the side of the base and top of the rear sight leaf. The lock plate is marked with the Springfield Armory Eagle/Shield motif and "U.S./SPRINGFIELD" and is fitted with the three-click tumbler. The barrel has the larger, "V/P/eagle head/P" proofs and the low arched breechblock marked "U.S./MODEL/1873". The rifle is fitted with two barrel bands that are correctly marked with the letter "U" on the right side, the two piece trigger plate and trigger guard bow with the smooth trigger. It has its original stock that has a single script "P" proof in the pistol grip area with a boxed, "SWP/1881" cartouche on the left side. It is fitted with a standard steel buttplate with "U.S." stamped on the heel.