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 modern restamped "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, retains strong traces of arsenal refurbished blue finish and mostly silvered case colors with the balance a smooth grey patina. The lightly sanded and reoiled wood is very good with some scattered minor dings and scratches and a few light chips near the cleaning rod channel and the barrel channel. Mechanically excellent.