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 fine with 75% plus arsenal refurbished casehardened/blue finish overall, gray and brown patina on the balance, some minor oxidation, and mild scratches and marks. The wood is also very fine and has numerous small dents and scratches and a partially smoothed "ESA" cartouche. Mechanically excellent.