.30-06 Springfield 7.62x63mm Caliber Cartridge Laser Bore Sighter Boresighter by GRG. $12.15. Quality grade Brass Casing. Sits perfectly in the chamber. No more wasting ammo. Quick and easy sighting and zero. Precision Laser Optics. No more wasting ammo and money sighting or zeroing in your iron sights, red dots, or scopes. A common misconception that the rifle is sighted from the factory. Dead accurate sighting and zeroing your scope at 100 yards.