Proper firearm maintenance begins long before you load a round into the chamber, and few tools offer as significant an advantage for initial setup as the laser bore sighter. This device allows you to align your scope or sights with the bore of the barrel without firing a single shot, saving ammunition and preserving your hearing. Learning how to use a laser bore sighter correctly transforms the zeroing process from a tedious chore of guesswork into a precise, efficient procedure that delivers accurate results the first time.
Understanding the Purpose and Benefits
The primary function of a laser bore sighter is to project a laser beam through the barrel from the chamber end, indicating exactly where that bullet will impact at a given distance. This tool eliminates the frustration of shooting blindly down the range to see where your first rounds land. By providing a visual reference on a target at 25 or 50 yards, it saves significant amounts of ammunition and drastically reduces the time required to get "on the X." This initial alignment ensures your point of aim closely matches your point of impact before you ever fire a live round, establishing a solid foundation for the sighting-in process.
Preparing Your Firearm and Area
Safety is the absolute first consideration when using a laser bore sighter, as you are dealing with the live bore of a firearm. Before inserting the device, you must ensure the barrel is completely clear of any obstructions or debris. Visually inspect the bore from the muzzle end using a borescope if possible, and always keep the action open if you are inserting the sighter from the chamber end. The area behind the target must be safe and free of people, animals, or property that could be damaged, treating the projected laser dot as if it were a bullet.
Step-by-Step Insertion and Activation
To begin the alignment process, select the correct caliber adapter for your bore sighter and insert it firmly into the chamber of your unloaded firearm. Next, place the laser bore sighter into the adapter, ensuring it seats securely so the laser aperture is positioned deep in the barrel. Turn the firearm so the muzzle points downrange toward your backstop or target wall, being mindful of the laser dot projecting behind you. Activate the laser, either via a built-in button or by inserting the required batteries, and verify that the beam is clearly visible on the target at a short distance.
Zeroing Scopes and Iron Sights
Once the laser dot is visible on your target, the realignment begins. If you are using a scope, look through the ocular and adjust your head position until the crosshair is centered precisely on the laser dot. This confirms that your eye is properly aligned with the scope's exit pupil. Then, use the windage and elevation turrets on the scope to move the reticle directly onto the laser dot. For firearms with iron sights, position the front and rear sights on the laser dot, ensuring the relationship between the two is consistent with your intended sight picture.
Confirming Accuracy at Distance
After performing the initial adjustments, you must verify the zero by firing a group at a longer distance, typically 100 or 200 yards. Because the laser travels in a straight line while the bullet arcs due to gravity, the point of impact will usually differ at extended ranges. This is normal and expected; the bore sighter provided the crucial starting point. Use the results of your test group to make fine-tuned corrections to the scope turrets, moving the point of impact to overlap with the point of aim. Repeat the firing sequence until the point of impact matches the point of aim at your intended distance.
