What component of the firearm serves as the handle?

The stock is a crucial component of a firearm as it serves as the handle, providing a stable grip for the shooter. It is the part that extends along the rear of the firearm, allowing the user to hold and aim the weapon effectively. The stock also contributes to the overall balance and control of the firearm during shooting, making it an integral part of ensuring accuracy and safety.

In contrast, the action is the mechanism that loads, fires, and ejects cartridges; the barrel is the metal tube that guides the bullet out of the firearm; and the receiver houses the action. Each of these plays a different role in the operation and functionality of the firearm, but none provide the primary grip and support that the stock does.