Featuring lightweight aluminum construction with a non-abrasive and highly corrosion-resistant finish, the Firefield Universal Red Laser Boresight is designed to provide fast and accurate zeroing while conserving ammunition. Compatible with most long gun barrels, this boresight comes equipped with a powerful, daylight-visible red laser, offering precision accuracy and tremendous cost savings. The compact and lightweight design easily fits in any range bag without forfeiting valuable storage space. This handy zeroing tool also provides an exceptionally long battery life, operating on just 3 powerful AG13 button batteries (included).