Easy to Use: Upgraded battery compartment make the laser bore sighter easy to install and lock the batteries. 2 sets batteries are included in the package. 

Improve Accuracy: Laser bore sight emit a straight laser beam, allows for quick and accurate resetting of any sights and optics, saving your time and cartridges.

Fit all calibers: Laser bore sight kit comes with 16pcs bore adapters to fit 22lr to 12GA caliber for pistols, rifles, handguns. Simply choose the caliber adapter and place the bore sighter unit in the muzzle.

Push Button Switch: Upgrade bore sight add push button switch function, control the laser conveniently, while pressing the switch and save power when you stop using.

Caution: This tool is not available for the barrel with silencers. Keep the laser beam away from eyes. Class IIIA laser, less than 5mW.