Which parts are included in the basic structure of a modern firearm?

The basic structure of a modern firearm typically includes the action, stock, and barrel.

The action is the mechanical part of the firearm that loads, fires, and ejects the cartridges. It is central to the firearm's operation and encompasses all the mechanisms needed for firing. The stock provides the framework for holding the firearm and serves as the interface between the shooter and the firearm, offering stability and comfort during aiming and shooting. The barrel is the metallic tube through which the bullet travels when fired, and it plays a critical role in determining the accuracy and range of the shot.

Including these three components provides a comprehensive view of the essential parts needed for a firearm to function effectively. While other components like the scope, chamber, trigger, and hammer are important features of specific firearms, they do not constitute the basic structure that enables the fundamental operation of a modern firearm.