Bolt (Guns)

Bolt for AR-15 Rifle

Bolt for an AR-15 Rifle

Bolt:

A bolt is the locking and cartridge-supporting mechanism of some gun designs. The bolt contains the firing pin, firing pin spring, extractor, and sometimes the ejector.

The bolt must be moved out of the way to load and unload the firearm. When the user must move the bolt manually, the firearm is classified as a bolt-action firearm.