The Armstrong gun was a type of artillery weapon that was used in the 19th century. The gun was named after its inventor, William Armstrong, and became famous for its use in various conflicts, including the Crimean War. However, there were several other names commonly associated with this weapon. Some of the synonyms for the Armstrong gun include rifled muzzle-loader, breach-loading gun, and quick-firing gun. These synonyms reflected the different variations of the weapon and the improvements made over time. Despite its reputation for being a highly effective firearms piece, the Armstrong gun eventually became obsolete due to the advancements in technology.