Get your shots on paper the quick and easy way! NcSTAR introduces 3 New Cartridge Laser Bore Sighters added to the TLZ Line-up. TLZ300W for the .300 Winchester Mag. Cartridge, TLZ7MM for the 7mm Remington Mag. Cartridge, and TLZ3030 for the .30-30 Winchester cartridge. 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 light weight yet tough as nails. Use it for your scopes, red dot sights, or even your iron sights!