The Sightmark Universal Laser Boresight provides the most convenient and accurate method for sighting in rifles and pistols of all types. Simply place the base of the boresight onto the end of the barrel of your weapon and it will attach magnetically. A laser dot will show exactly where your gun 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 Universal 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 bore sight for convenient use in the field. The Sightmark Universal boresight is protected by a Limited Lifetime Warranty. Features Most accurate Universal Boresight on the market Works on all rifles and pistols Special retractable arbor for instant centering Precision Accuracy Reliable and Durable Fastest gun zeroing and sighting system Reduce wasted cartridges and shells Compact and lightweight Easy to pack and travel with Included in Package Battery Pack Carrying Case Specifications Caliber .17 to .50 Laser Wavelength nm 532 LED Type Visible Green Laser Power 5mW Battery Type CR2 Battery Life or equal to 1 Hour Range for Sighting 15-150 yards Dot Size 2 100 yards Operation On/Off switch Construction Aluminum Temperature C 10 to 50 SOLD QUANTITY 1