Smoothbore! The Rodman was produced by the Union mostly during the American Civil War, during which conflict the utility of rifling within a cannon's bore was made clear. Some Rodmans were "converted" after the war with iron, rifled "sleeves" afixed inside the barrel. This 10" smoothbore gun would have been converted to an 8" rifled gun, which it clearly was not. Click here to see the muzzle of a Rodman that did go through this conversion, which happens to be the very gun at Fort Knox's entrance! Additionally, what's fun about these guns is that their pedigree is proudly stamped at the muzzle: This Rodman was cast in 1865, at Fort Pitt Foundry in Pittsburgh, Pennsylvania.