The Sightmark Laser Boresight provides the most convenient and accurate method for sighting in rifles and shotguns of all types. Simply chamber the boresight like a regular bullet and a laser dot will show exactly where the rifle is aiming. Its 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 Boresight is sure to take the frustration out of sighting in almost any gun. Its 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 for convenient use in the field. The Sightmark Laser Boresight is available in several calibers and gauges for use with all the most popular rifles and shotguns. Sightmark-Make Your Mark! Features Precision Accuracy Reliable and Durable Fastest gun zeroing and sighting system Reduce wasted cartridges and shells Carrying case included Compact and lightweight Easy to pack and travel with Battery Pack Laser Wavelength nm 632-650 LED Type visible red laser Power 5 mW Battery Type AG5 2, AG3 3 Battery Life 1 hour Range for Sighting 15-100 yards Dot Size 2in 100 yards Operation On/Off End Cap Construction Brass Temperature C 10 to 50 SOLD QUANTITY 1