What component is responsible for feeding rounds into the chamber?

The component responsible for feeding rounds into the chamber is the magazine. The magazine serves as the storage device for cartridges and is designed to hold multiple rounds in a specific configuration. When the firearm is cycled (either manually or automatically), the magazine pushes a round up into the chamber, making it ready for firing.

The extractor is a different component, which pulls the spent cartridge case out of the chamber after firing, while the ejector is responsible for pushing the spent case out of the firearm. The recoil spring plays a crucial role in cycling the action of semiautomatic and automatic firearms by returning the slide or bolt to its forward position after firing. However, it is the magazine that plays the key role in supplying new rounds to the chamber for the firing sequence.