Universal Multi-caliber Green Laser Boresighter Kit BE-GHXL-223Kit Advantage: All made of brass

Advantage: All made of brass

15 x LR626 batteries

Also it is beautiful and it won't damage the barrel

357 MAG dummy rounds(completely safe)

Fully Adjustable Audio & Silent Operation---Customize your training atmosphere with 7 volume levels or enable mute instantly

Universal Multi-caliber Green Laser Boresighter Kit BE-GHXL-223Kit Advantage: All made of brassThis is a professional laser bore sight kit for Multiple Caliber suitable for All . 17 to 12GA Rifles Pistols Widely application: It is designed to help you quickly set your firearms "on paper". Increase the accuracy and speed to sight the bore for serious hunters, shooters, Policemen. Save both time and money by avoiding prolonged live fire tests. Easy to use: Simply choose the caliber adapter and place the laser bore sight unit insert the muzzle.