THE Vector Muzzle Drop-in Green Laser Bore Sight.
Magnetic, Super Easy to Use, 5mW, Fit Almost all Calibers (rifle, air gun and pistol etc) with Steel Muzzle.
By project a laser beam from the center of the barrel axis of firearm, this laser bore sight collimator allows you to instantly and accurately set your sight or scope.
The laser light emitted from the laser bore tool travels in a straight line while the bullet follows a trajectory. Even though the use of this device will get you very close, final adjustment should be made at the range.

Specification
Power:5mW
Wavelength:532nM
Length:103mm (4.0 inch)
Dia.:18mm (0.7 inch)
Dia.:20.5mm (0.8 inch), magnetic end part
Weight (net):47g (1.6 ounces)
Material:High quality 6061 T6 aluminum
Finish:Black matte
Battery Type: CR2
To use the laser bore sight, put it into the muzzle. The build-in magnet will attach and center align with the muzzle.
By project a laser beam from the center of the barrel axis of fire arms, this laser bore sight collimator allows you to instantly and accurately set your sight or scope.
The laser light emitted from the laser bore tool travels in a straight line while the bullet follows a trajectory. Even though the use of this device will get you very close, final adjustment should be made at the range.
The laser bore sight was already center aligned during the manufacture Fit almost all the calibers, max to 50 BMG
With elastic sling to have the laser bore sight hang onto the muzzel to aviod the drop-in by accident Packge includes: rubber cover with sling