Remington Military contract Rolling Block Possible .43 Spanish (AL7121)

NSN, circa 1870, possible .43 Spanish, 35" round barrel. Barrel and receiver is a bronze/grey patina. Bore is fair with pitting visible in the grooves. Rifling remains strong. Regimental markings are stamped on the right side of the receiver. Stock has been lightly sanded at some point. Action functions correctly.