A bore sight is a tool that helps you align the sights on your rifle with the bore of the barrel. This is important because it ensures that your shots are accurate and hit where you are aiming. There are many different types of bore sights available, but they all serve the same purpose. The cost of a bore sight will vary depending on the type you choose and where you purchase it from. Some cheaper options may be as low as $20, while more expensive ones can cost up to $100. If you plan on using your rifle for hunting or competition shooting, it is worth investing in a good quality bore sight.