After conclusion of the Civil War, approximately 11,000 carbines were refurbished and rechambered for .50-caliber rimfire. Barrels were sleeved and a device known as "Stabler cut-off" was added to convert the arm to single-shot function. Often they were refinished and restocked. Inspector's marks "ESA" will be found in an oval cartouche on left side of the stock. These alterations took place in 1867 and 1868.