Hello, the gun in question is a 1859 Sharps carbine that was converted in 1863 to 50-70. The cartouche on the gun is JFC and the serial number is 62572. I am seeking to find out when and to who the gun was issued if possible. While I know that the request is a longshot at best, I would appreciate any additional information on this gun. Does anyone know of a resource that could help in a more thorough research of this gun? Thank you in advance for any and all replies, da V.