Sighting a rifle scope is the process of aligning the reticle of the scope with the barrel of the rifle. This is important to ensure that the rifle is shooting accurately. There are a few different ways to sight a rifle scope, but the most common method is to use a boresighter. A boresighter is a tool that is inserted into the barrel of the rifle and projects a laser beam. The laser beam can then be used to align the reticle of the scope.
There are a few different types of boresighters, but the most common type is a laser boresighter. Laser boresighters are relatively inexpensive and easy to use. They are also very accurate, and can be used to sight in a rifle scope in just a few minutes.