The Sightmark Triple Duty Universal Laser Bore Sight provides the most convenient and accurate method for sighting in of all types. Simply place the arbor of the bore sight into the barrel of your weapon; the base will attach magnetically with the retractable arbor centering the bore sight automatically. A green laser dot will show exactly where your aiming making it easy to sight in any scope without firing a single round. Live fire is only needed to fine tune the weapon being sighted in order to compensate for inconsistencies, such as bullet drop due to distance. Perfect for hunters, competitive shooters and law enforcement, the Sightmark Triple Duty Universal bore sight is sure to take the frustration out of sighting in almost anything. It's easy to use and will quickly save both time and money by avoiding prolonged live fire tests at the range; use the extra ammo for honing those skills and for the hunt. A lightweight carrying pouch protects the bore sight for convenient use in the field