Bushnell Laser Bore Sighter: .22-.50 Caliber: This bore sighter is a precision instrument constructed of the finest materials and assembled by highly skilled craftsmen for a lifetime of trouble-free use. This laser bore sighter is designed to quickly get your rifle, handgun, or shotgun “on the paper” and will save you time and money. Final sighting-in should be done by shooting the firearm and fine tuning the adjustments.