Professional Laser Bore Sighter Green. The Professional Laser Bore Sighter Uses A High Power Daylight Visible Green Laser And A High-Strength Magnetic Connection To The Barrel To Deliver Fast Accurate Bore Sighting. This System Works With Virtually All Firearms; Rifles, Shotguns, Handguns. The Magnetic Connection To The End Of The Muzzle Provides More Precise Alignment With The Bore Without The Risk Of Damaging The Bore, Compared To Arbor Style Bore Devices. A Machined Aluminum Body With Soft Rubber Over-Molding Houses The Laser Module. Each Unit Is Hand Tuned During The Manufacturing Process With An Innovative Calibration Mechanism. This Allows For Maximum Precision, Thus Ensuring The Best Bore/Optic Alignment Possible. Once Precision Calibration Is Completed The Laser Module Is Permanently Secured In Place Insuring Reliable Performance And Durability. Molded Plastic Storage Case Included. Runs On A Single Lithium 123A Battery (Included). Makes Initial Scope Adjustment Simple, Fast And Precise Compatible With A Wide Variety Of Guns High Power Daylight Visible Green Laser.