A bore sight is a tool that helps you align your crossbow's scope with the barrel. It projects a laser beam from the center of the scope's reticle, allowing you to see where the crossbow is aiming. This can be a valuable tool when sighting in your crossbow, as it can help you get on target quickly and accurately. However, there are a few things to keep in mind when using a bore sight. First, because the laser beam is coming from the center of the scope's reticle, it will be offset from the actual path of the arrow. This means that you'll need to make adjustments to your scope before taking your shot. Second, because Bore sights are calibrated for firearms, they may not work perfectly with your crossbow. Finally, while bore sights can help you get on target quickly, they won't necessarily help you shoot more accurately. In other words, don't rely on them too much - practice makes perfect!