Vector Optics VipeRay 9.3x62mm Cartridge Red Laser Bore Sight
By project a laser beam from the center of the barrel axis of fire arms, this laser bore sight collimator allows you to instantly & accurately set your sight or scope etc.
The laser light emitted from the laser bore tool travels in a straight line while the bullet follows a trajectory. Even though the use of this device will get you very close, final adjustment should be made at the range