The Osprey Laser Boresight is a green laser ensuring your first shot is on target. Osprey boresights are designed to save you time and money with less wasted ammo. They feature high quality brass construction with reliability and durability. They are extremely fast, easy to use, and are a cost-effective method to accurately sight your weapon. Laser boresight is activated when the bolt is slowly closed down on the rifle. The laser dot, which has been precisely calibrated in the cartridge, is projected down the barrel and will get you within 1.5 inches of center by following the simple instructions. Osprey Global boresights are backed by the industry leading no-nonsense lifetime warranty.