Bolt Carrier

The bolt carrier is a key component of a firearm's action system, specifically in semi-automatic and automatic firearms. It is responsible for housing and moving the bolt, which is the part of the firearm that contains the firing pin, extractor, and other components necessary for the firing and extraction of cartridges.

The bolt carrier is typically a metal component that slides back and forth within the firearm's receiver. When the firearm is fired, the bolt carrier moves rearward under the force of the expanding gases from the fired cartridge. This movement allows the spent cartridge casing to be extracted from the chamber and ejected from the firearm.

After the spent casing is ejected, the bolt carrier moves forward again, chambering a new cartridge from the magazine into the chamber. This process is repeated each time the firearm is fired, allowing for the continuous cycling of cartridges and the firing of multiple rounds.

In addition to its role in the firing and extraction process, the bolt carrier also helps to control the rate of fire in automatic firearms. It can be designed with various features, such as a heavier or lighter weight, to influence the speed at which the firearm cycles and fires.

Overall, the bolt carrier is a critical component of a firearm's action system, playing a crucial role in the firing, extraction, and chambering of cartridges.