Gun Wiki

The bolt is the part that feeds the cartridge into the chamber. It houses the firing pin and ejector, and the extractor is attached to the exterior (usually with a pin, so as to allow the extractor to grip the rim of the cartridge case).

It is an integral part of a firearm's operation; without the bolt (or an equivalent), it cannot fire.

Bolt designs[]

Telescoping bolt[]

A telescoping bolt is a bolt that wraps around the breech end of the barrel. This bolt design is often used to reduce overall weapon length without sacrificing barrel length or bolt weight.

Turn bolt[]

A turn bolt refers to a firearm component that where the whole bolt without using a bolt carrier turns to lock/unlock. This is mostly used to describe manually operated bolt action firearms, but also on some automatic firearms.

Rotating bolt[]

A rotating bolt is a bolt that locks into a barrel extension via use of lugs and using a bolt carrier. There is always a slot milled out for a cam pin in the bolt carrier in order to facilitate the rotating of the bolt itself as it locks into the barrel extension.