The Sightmark Laser Bore Sight provides the most convenient and accurate method for sighting in rifles of all types. Simply chamber the laser bore sight like a regular bullet and a laser dot will show exactly where the rifle is aiming. Using Laser Bore Sights it’s easy to sight in any scope without firing a single shot. 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 Laser Bore Sight is sure to take the frustration out of sighting in almost any gun. Laser Bore Sight is 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 shooting skills and for the hunt. A lightweight carrying pouch protects the laser of the bore sight for convenient use in the field.The Sightmark Laser Bore Sight is available in several calibers and gages for use with all the most popular rifles and shotguns. Compatible Calibers: .25-06 REM, .270 WIN, .30-06 SPR, .308 WIN, .8mm-06, .35 WHELAN, .280 REM, 7mm EXPRESS, 7.7x58 JAPANESE, Included Accessories: Battery pack for Laser Bore-Sight, Laser Bore-Sight carrying case,