Which component of a semi-automatic firearm is responsible for chambering a new round after a shot?

The component responsible for chambering a new round after a shot is the slide. In a semi-automatic firearm, when the trigger is pressed, a round is fired and the energy from that shot cycles the slide backward. This action ejects the spent casing and compresses the recoil spring. As the slide moves forward again, it strips a new round from the magazine and chambers it into the barrel, readying the firearm for the next shot. This process is essential for the operation of semi-automatic firearms, allowing for rapid successive firing without manual intervention to load each round individually.

The other components play different roles: the trigger is used to initiate the firing action, the magazine holds the ammunition in place, and the barrel directs the projectile upon firing, but it is the slide that orchestrates the cycle of firing and reloading a round.