Outdoor Hunting Tools Red Dot Laser Bore Sighter Gauge Barrel Target Cartridge Boresighter 20 GA SUPTIntroduction:This boresighter is designed for sighting in your shotguns without firing a shot. Simply install the included batteries， place the entire assembly into the chamber， and gently close the action. The sight will emit a straight red laser beam， providing precise reference for zeroing in your sights or scopes.Features:Fits 20 Gauge Shotgun chambersLight weight and durableWorks with any sights (iron， optical， laser， holographic， etc)Windage and elevation adjustableLong sighting rangeSpecifications:Max. Output Powerless than 5mWWeight28gMaterialAluminumLaser wavelength635-655nmSighting Range10 to 75ydsColorRedPower3x AG3 batteriesPackage Included:1 x Laser Bore Sighter4 x AG3 batteriesTips:Thanks your purchase from our shop，hope you will enjoy your online shopping.Please do not hesitate to contact us at first when you have any problems of our item，thanks