Gerber Red Laser Bore Sighter features a bright, battery-powered red laser that makes rapid, ultra-precise work of bore sighting. The Gerber Laser Bore Sighter was created to meet the demands of gunsmiths and serious shooters. This Bore Sighter by Gerber allows you to quickly sight in your weapon without wasting ammunition. The Gerber Laser Bore Sighter includes arbors for .22- through .50-caliber firearms. You'll obtain your best shot and hold zero without ever wasting a bullet when you use the Gerber Laser Bore Sighter.