In approximately 1871 Springfield Armory converted 1,108 Burnside-Spencer carbines by fitting the actions with rifle length barrels chambered for .50 caliber ammunition with three groove rifling. The armory also refurbished the parts and added a nearly full length forearm with two barrel bands and a slotted cleaning rod. The left side of the stock, just behind the saddle ring base, is marked with the correct "ESA" cartouche, and the other components have the standard Burnside and armory markings including matching serial numbers. It has a blade front sight, notch and folding ladder rear sight, and the Stabler cut-off device.

Very good as arsenal converted/refurbished, retains 20% arsenal blue finish with the balance a smooth grey patina and some scattered patches of very light pitting. Faded patterns of original case colors remain on the receiver. The sanded, reoiled wood is also very good with some scattered light handling marks, some chipping along the ramrod channel, and some oil darkening around the receiver. Mechanically excellent.