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A boresighting system that is both compact and self-contained uses a bright red laser beam. The beam is aligned with the bore axis making it perfect for sighting scopes, holographic red dot sights, and “iron” sights. No need to fire a shot as this system provides accurate alignment. A powerful magnet holds the sighter securely on the muzzle of any rifle, pistol or shotgun with no need to insert anything into the bore or chamber. Install the three batteries that are included into the battery compartment, center the boresighter on the muzzle using the centering guides on its rear, and switch it on. To zero on the dot, aim at a target located 20-30 yards away and adjust the sights' windage and elevation. For the final sight adjustments, go to the range and test shoot. The system easily fits in a pocket and comes with a padded nylon carrying case.