Posted by a reviewer on Amazon

The previous laser bore sight lasted approximately five minutes and cost 2

Posted by a reviewer on Amazon

Have to remove the battery when not in use other than that works great

Posted by a reviewer on Amazon

The first shot was only about an inch from dead center at 50 yards

Posted by a reviewer on Amazon

The laser was bright and the dot wasnt too big

Posted by a reviewer on Amazon

This rarely if ever happened just right as the slightest tilt in the seating of this boresight in the barrel would take it off the center axis so that rotating the laser would cause the laser light to mark out a small circle that was several moa in diameter rather than being dead centered

Posted by a reviewer on Amazon

Of course with these chamber loaded laser boresights there is also the potential for the lasers to be misaligned off the center axis

Posted by a reviewer on Amazon

Plus there is the potential for the boresight to not fit the chamber properly