What is the part called that is used to aim a firearm?

The correct answer is "Sight" because sights are the components on a firearm that help the shooter align the gun with the target for accurate aiming. They typically consist of two parts: the front sight, which is located near the muzzle of the firearm, and the rear sight, which is positioned toward the receiver. Proper use of the sights allows a hunter or shooter to make precise shots by ensuring that the line of sight is correctly aligned with the desired point of impact on the target.

The muzzle refers to the front end of the firearm where the bullet exits but does not have any function related to aiming. The trigger is a mechanism that is pulled to fire the weapon, and while it is critical for operating the firearm, it is not involved in the aiming process. The stock is the part of the firearm that the shooter holds against their shoulder, providing stability and support while aiming and firing, but again, it does not serve the specific purpose of aiming.