1. Stock

Supports the action and the barrel of a firearm and is made out of either wood or synthetic material. The stock may be a single piece or two pieces, depending on the manufacturer.
3. Barrel

The barrel is the tube-shaped part of a firearm through which ammunition is fired. The inside of the barrel is called the bore.
4. Sight

An alignment device to help aim a firearm. In the image above the rifle uses an open sight. Other types of sights include shotgun bead, peep or aperture and telescopic.
5. Muzzle

The muzzle is the opening at the end of the barrel. This is where the projectile exits after it has been fired down the barrel.
6. Forestock

The forestock is the part of the stock in front of the trigger that supports the barrel