銃

1. Origins, structure, and basic meaning

• Structure: 銃 (じゅう) is a broad noun for a gun or firearm.
• Basic usage: It can refer to an old gun in a museum or a weapon laid down by a soldier in a story.
  • 博物館の展示には古い銃が置かれていた。 — An old gun was displayed in the museum exhibit.
  • 物語の兵士は銃を地面に置いて降伏した。 — The soldier in the story laid down the gun and surrendered.

2. Common pitfalls and similar expressions

• Broad firearm category
  • 銃 does not by itself fix one particular type of firearm. Because the examples do not specify a type, do not narrow it further without context.