Possible 100 words article: When referring to a type of firearm, the expression "passage arms" is a relatively uncommon term that could have various synonyms depending on the context. In general, a passage arm is a single-barreled, short-range gun that was often used for self-defense or hunting small game during the 18th and 19th centuries. Some synonyms for passage arms could include terms such as pocket pistol, dueling pistol, blunderbuss, muff pistol, pepperbox, or over-and-under gun. Each of these terms refers to a specific type of firearm or a certain feature of the firearm that distinguishes it from other guns. For instance, a dueling pistol was primarily intended for formal duels with another person, whereas a pepperbox had multiple barrels and could fire several shots before reloading.