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This self-contained boresighting system is incredibly easy to use and compact in design. It can fit directly into the chamber of either your rifle or pistol and can project a highly visible, powerful red laser beam that is aligned with the bore axis. The device can be used with a variety of scopes, holographic red dot sights, and ‘iron’ sights. The entire laser system and batteries are safely stored in a durable, machined brass housing; resembling a cartridge case. To switch on the laser, simply insert the batteries and screw the cap housing on. Conversely, to switch off the laser, just remove the batteries. Once the assembly is inserted into the chamber and the action is gently closed, aim your weapon at a target approximately 20-30 yards away. You can then adjust the windage and elevation of the sight in order to ensure that the point-of-aim is zeroed on the dot. This prevents the weapon from shooting high. Afterward, you can go to the range for a few test shots and make the necessary final sight adjustments. When not in use, simply store the boresighter in the included nylon carrying case, making it easy to transport in a pocket, tool kit, or range bag. This boresighting system is available in a variety of calibers.