What action continues after feeding to place a round into the chamber of the weapon?

Chambering refers to the action of placing a round into the chamber of a weapon's firing mechanism after feeding. This process ensures that the round is correctly positioned for firing. The term 'chambering' specifically describes the movement that occurs to align the cartridge with the firing pin, making it ready to be fired when the trigger is pulled.

The chain of actions in firearm operations generally begins with feeding, where the ammunition is provided to the chamber from the magazine. After this feeding process, the chambering action takes place to secure the round in the chamber. This is an essential step because, without proper chambering, the firearm cannot fire effectively, or at all.

While the other options reflect various stages in the ammunition handling process, they do not accurately describe the specific action of placing a round into the chamber after it has been fed. Firing pertains to discharging the weapon, locking relates to securing the bolt in position, and extracting refers to the removal of a spent cartridge from the chamber after firing. Thus, chambering is the precise term that aligns with the action described in the question.