All modern firearms have three basic groups of parts. what are these parts?

The three basic group of parts for all modern firearms are: action, stock, and barrel.

The action is the heart of the firearm - the moving parts that load, fire, and eject the shells or cartridges.

The stock serves as the handle of the firearm. It can be composed of one or two pieces and is usually made from wood or a synthetic material.

The barrel is the metal tube that the projectile travels through.