Here is a U.S. Model 1871 Army rolling block from my collection of U.S. military longarms. This is one of 10,000 made for the Army 1871-1872. .50/70 caliber. The hammer goes to half-cock automatically when the breechblock is closed. It's quite similar to the Navy model (12,000 made), but is a bit rarer. It was made at Springfield Armory under Remington's patent, and so marked. This one was made in 1872. I handloaded some .50/70 rounds with cast bullets for this one and my 1866 and 1868 trapdoors, and they shoot quite well in these old rifles.

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