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 featuring a manually operated cylindrical bolt with an external lever which the shooter pulls back to open the breech and extract the empty case of a fired cartridge and pushes forward to push a fresh cartridge into firing position and close the breech.