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By certification 
Descriptions:
1.Bore sights were a big help in the process of zeroing your scopes, showing how far off they were after they were installed on the rifle, helping in getting to the target of having only minor adjustments.
2.Save Time: Quick reference at different ranges (yardage) and fits snug in the bore to sight rifle in with a few rounds.
3.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.
Specifications:
1.Material: Brass
2.Laser Wavelength: 632-650 nm
3.LED Type: Visible Red Laser
4.Sighting Range: 10-75 yards
5.Dot Size: 1.5" @ 100 yds
6.Laser Beam:<5 mw
7.Battery Life When Continuous On: 1 1/2 to 2 Hour
http://www.sabretacticalsupply.com/
