1.Easy-to-use, self-contained boresighting  system fits in the chamber of your rifle or  pistol and projects a powerful red laser  beam aligned with the bore axis for sighting  to the point-of-aim without firing a shot.  

2.Works with scopes, holographic red dot  sights, and variety sights.

3.Durable,  machined brass housing looks like a  cartridge case but actually contains the  entire laser system and batteries.

4.Insert  the batteries and screw the cap on the  housing to turn on the laser; remove the  batteries to turn off.

5.Insert the entire  assembly into the chamber, gently close the  action, and aim at a target 20-30 yards  away.

6.Adjust windage and elevation of the  scope or sights so point-of-aim is zeroed  on.

Specifications:

1.Range: 1-100 yards

2.Laser Type: Class IIIA Visible Red Laser

3.Laser wavelength: 635-655nm

4.Output power: < 5mW

5.Battery: 3 X LR626

6.Total length: 30mm

http://www.sabretacticalsupply.com/