EZshoot Bore Sight 9mm Red Laser Boresighter with 4 Sets of Batteries

EZshoot Bore Sight Laser 9mm Red Dot Boresighter with Batteries SPECIFICATIONS -- Laser Wave length (nm:) 640 to 660 -- LED Type: visible red laser -- Power: -- Construction: Brass -- Sighting Range: 15 to 100 yards -- Temperature: -10℃ to 40℃ -- Battery Type:2 X AG3 (8 Included) -- Class IIIA laser less than 5mW How to use the bore sight? 1.Unscrew the back cap from the bore sight by turning counter clockwise 2.Stand the bore sight on a flat surface with the laser side pointing down 3.Insert batteries (+ side up) inside the rear opening 4.Carefully push down and turn the screw cap clockwise to tighten the cap (the laser is now on) 5.Place in chamber and close the bolt 6.To remove - open the bolt if it does not automatically extract manually remove the unit by tilting the barrel upward (always practicing safe firearm practices) 7.Unscrew the back and remove