A firearm action refers to the mechanism that loads, fires, and ejects cartridges in a firearm. It encompasses various systems, such as bolt-action, lever-action, pump-action, and semi-automatic, each defining how the firearm operates. This action is crucial for the firearm's functionality and determines its firing sequence and handling characteristics.
Design of the firearm
You do not list anything following.
You don't have anything following, but an example would be the typical double barreled shotgun.
You did not list any "following". Hardly fair to make us guess what they were. By the way, the image shown above is an example of a pump action firearm. The forend is "pumped" back and forward to eject a fired shell, and load a new one.
Two basic styles of firearm actions are single action and double action.
Half barrel is not a type of firearm action.
Type of firearm action
The action spring is typically housed within the stock or buffer tube of a firearm. It provides the necessary tension to cycle the firearm's action and chamber a new round.
It is the action performed by the object.
No such thing. The Glock is not a double action firearm.
Action or reciever
Stock , Barrel & Action