The Model 1871 rolling block was made at Springfield Armory under royalty agreement with Remington. These were manufactured for the Army in caliber .50/70 in 1871 and 1872. They are fairly scarce (10,000 total), little known and quite valuable. Mine was made in 1872, and I've fired it with light handloads. Interestingly, it has the same rear sight as the Model 1878 .50/70 trapdoor. It's marked with a spread eagle, "U.S." and "SPRINGFIELD ARMORY" over "1872." It has an unusual action. The hammer falls to half-cock when the action is closed, and then must be cocked again to fire. This was an Army safety requirement to prevent the breech from opening if the firing pin was stuck in the forward position, firing the cartridge when the action was closed..
John