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. [breech mechanisms and breech mechanism components]
10. breech mechanisms

Anotations

Scope note:

Mechanisms on breechloading firearms in which a lever, usually an extension of the trigger guard, is used to open and close the breech. In repeaters, the lever also ejects spent cartridges, loads fresh ones, and cocks the firearm.