The NcSTAR .300 Winchester Magnum Cartridge Red Laser Bore Sighter fits .300 Winchester Magnum chambers. Just install the provided batteries and twist the cap on. Drop the laser into the chamber of your rifle and you have a laser that is projecting the exact alignment of the bore. This tool is extremely useful for initial scope sight in or to confirm zero before the big hunt.
Made of durable aluminum, the Cartridge Laser Bore Sighter is lightweight yet tough as nails. Use it for your scope's red dot sights or even your iron sights.