Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Components (hierarchy name)
4. components (objects parts)
5. [components by specific context]
6. weapon components
7. projectile weapon components
8. firearm components
9. [firearm barrels and barrel components]

Anotations

Scope note:

In firearms, metal tubes closed at one end that hold the projectile and the propellant charge and, utilizing the explosive force of the charge, act as the path for the projectile. They may be smoothbore or rifled.