Save time, money and ammunition with the LaserLyte Laser Boresight. Incorporating LaserLyte's patented one-piece design and caliber-fitting systems the Laser Bore Sight is fifty percent smaller than the previous model. This easy-to-use product can get a shooter within three to four inches of the bull's eye at 100 yards in about three shots. Constructed from tough T6 aluminum, the Laser Boresighter comes in a sleek red finish and works great on any weapon with at least three inches of barrel length. The Universal Laser Boresighter makes sight-in sessions a breeze for scopes, lasers or iron sights on any firearm from .22 to .50 caliber with included adapters. The maximum versatility of this system also works with accessories (sold separately) that include a shotgun adapter for .50 to .75 caliber and a scope leveler. The Universal is also excellent for modern rifles because its design works with most flash suppressors and muzzle brakes. For .17 or .22 caliber rimfires, the "Mini" is one of the few on the market that will work for both calibers. The Laser Bore Sight activates with a roll switch and is powered by three "393" Silver Oxide (included) or equivalent batteries that provide one and a half hours of continuous use.