Ledsniper&reg;red Laser Bore Sight Kit Boresighter for .22 to .50 Caliber Scope Handgun Rifles Laser boresighter for gunsmiths and serious shooters Makes it easy to sight a newly mounted rifle scope Bright, battery-powered laser is rapid and precise Includes 4 arbors for .22- through .50-caliber rifles as well as 20 and 18 gauge shotguns LR-50 batteries (included)