1. Barrel: The long metal tube through which the bullet travels.

2. Chamber: The part of the barrel where the cartridge is held before firing.

3. Extractor: The mechanism that removes the spent casing from the chamber.

4. Ejector: The mechanism that expels the spent casing from the receiver.

5. Frame or Receiver: The main part of the gun that houses and supports the other parts.

6. Firing Pin: The part that strikes the primer to ignite the propellant.

7. Grip: The part of the gun that the shooter holds onto.

8. Hammer: The part that strikes the firing pin.

9. Magazine: The device that holds the cartridges and feeds them into the chamber.

10. Safety: The mechanism that prevents the gun from firing when it is not intended to.

11. Sights: The devices that help the shooter aim the gun.

12. Stock: The part of the gun that connects the grip to the shoulder of the shooter.

13. Trigger: The part of the gun that the shooter pulls to fire the gun.

Additional Parts:

- Recoil System: The mechanism that absorbs the force of the gun's recoil.

- Feed Ramp: The inclined surface that guides the cartridge from the magazine into the chamber.

- Selector Switch: The mechanism that allows the shooter to select between semi-automatic and automatic fire (if applicable).

- Dust Cover: The part of the receiver that covers the ejection port.

- Magazine Release: The button or lever that releases the magazine from the gun.