The Sightmark® Laser Boresight is chambered in the .243, .308 or 7.62x54 rifle like a regular cartridge and a red laser dot shows exactly where the shooter is aiming. This accessory is perfect for hunters, competitive shooters and law enforcement and device significantly reduces wasted cartridges and shells. The shooter and simply adjust the sight or scope and save extra ammo for the hunt. This device has been tested and recommended by the National Tactical Officers Association. It includes a carrying case, three (3) AG3 batteries, and instructions.