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

• A. Action, stock, barrel
• B. Receiver, magazine, barrel
• C. Bolt, stock, trigger
• D. Receiver, stock, scope

Answer: (A)

Three broad groups describe how a modern firearm is put together: the action, the barrel, and the stock. The action houses the mechanisms that load, lock, fire, extract, and eject, making it the heart of how the gun operates. The barrel is the tube through which the bullet travels, guiding its path and influencing velocity and accuracy. The stock provides the support and point of contact for the shooter, helping you aim and control the firearm.

This combination is the best fit because it covers the gun’s main functional blocks. Other options mix in parts that aren’t one of the three primary groups—things like magazines, scopes, or specific components such as bolts or triggers—these are important parts, but they fall under the broader categories of action or accessories rather than forming the three core groups.