Use to attaches to the inside of a firearm's muzzle using an o-ring system and features a very bright 635NM laser.
Fit .22 through .50 caliber firearms, as well as 12 and 20 gauge shotguns .
To Help your scope go on straight easily and quickly.

Instructions:
1.Place the target (Included) on a wall 25 feet from the muzzle.
2.The firearm must be secured and clamped into position with the muzzle located at 25 feet from the target. The barrel should be level in relation to the target.
3.Install  Boresighter into Muzzle .
4.Set the scope at low power and switch on boresighter. Adjust the position of the firearm to center the laser within the “Laser Target” Located below the dotted line crosshair on the target.