This conversion was performed circa 1871 when approximately 1,108 of these carbines were refurbished by Springfield Armory after the conclusion of the Civil War. This example was originally manufactured by the Burnside Rifle Co. as a Model 1865 carbine and has the standard markings on the top of the receiver. Springfield Armory replaced the original barrel with a three-groove .50 caliber barrel that was 32 1/2 inches long and a full length forearm with two barrel bands and an oval "ESA" cartouche on the left side of wrist. Blade front and folding ladder rear sights, saddle ring and bar mounted on the left wrist and iron cleaning rod with slotted and swollen serrated head.