How To Use Simmons Laser Boresighter

Laser boresighters offer a method for preliminary firearm sighting. This article provides instructions on using a Simmons laser boresighter.

Preparing for Boresighting

Safety Precautions

Before beginning, ensure the firearm is unloaded. Verify the chamber is empty and the magazine is removed. Handle the firearm with muzzle pointed in a safe direction at all times.

Required Tools and Materials

You will need your Simmons laser boresighter, the firearm to be sighted, appropriate arbors or adapters for your caliber, a target (placed at a reasonable distance, typically 25 yards), and tools for making scope adjustments.

Inserting the Boresighter

Selecting the Correct Arbor

The Simmons boresighter includes various arbors to accommodate different caliber firearms. Choose the arbor that matches your firearm's caliber. The arbor should fit snugly into the muzzle without excessive force.

Installing the Arbor

Insert the selected arbor into the muzzle of your firearm. Ensure it is seated correctly and securely. Some models may require a slight twist to lock the arbor in place.

Attaching the Boresighter Unit

Attach the laser boresighter unit to the installed arbor. The boresighter should align with the bore's axis. Secure the unit according to the manufacturer's instructions. This often involves a friction fit or a small set screw.

Aligning the Scope

Initial Observation

With the boresighter installed and the firearm securely supported (e.g., on a sandbag or gun vise), observe where the laser dot appears on the target. This is your initial point of impact.

Adjusting the Scope Turrets

Adjust your scope's windage and elevation turrets to move the reticle towards the laser dot. The goal is to align the crosshairs with the laser dot. Note the direction of the adjustments (e.g., "up" and "right").

Important: One click on your scope turret moves the point of impact a specific amount, as indicated on the turret itself (e.g., 1/4 MOA per click). Refer to your scope's manual for precise adjustment values.

Fine-Tuning Adjustments

After making initial adjustments, recheck the laser dot's position and make further refinements to the scope turrets. Continue this process until the reticle is as close as possible to the laser dot. Remember that a boresighter only gets you "on paper" and live firing is required to achieve a precise zero.

Troubleshooting

Laser Dot is Not Visible

If the laser dot is not visible, check the batteries in the boresighter. Ensure they are properly installed and have sufficient charge. Also, verify that the boresighter is switched on.

Inconsistent Laser Dot Position

If the laser dot's position fluctuates, check the arbors and the boresighter unit for secure attachment. Any play or looseness can affect the laser's alignment. Also, ensure the firearm is resting on a stable surface.

Arbor Does Not Fit Properly

If the provided arbors do not fit your firearm's caliber, verify that you have selected the correct size. If you still encounter issues, consider contacting Simmons customer support for assistance.

Considerations and Limitations

Boresighting is Not a Substitute for Live Firing

Boresighting provides a preliminary alignment, but it is not a substitute for live firing and fine-tuning at the range. Environmental factors, ammunition variations, and individual shooting styles can all affect the point of impact. Always confirm zero with live ammunition.

Parallax Considerations

Parallax can affect the accuracy of boresighting, especially at close ranges. Ensure your eye is centered behind the scope to minimize parallax error. If your scope has adjustable parallax, set it to the appropriate distance for the target.

Environmental Factors

External elements can influence boresighting. Bright sunlight can make the laser dot difficult to see. Indoor conditions with controlled lighting are generally preferable. Windy conditions can introduce instability, affecting the firearm's position.

Specific Simmons Boresighter Models

Simmons .22-.50 Caliber Laser Boresighter

This model includes multiple arbors to fit calibers from .22 to .50. Follow the general instructions above, ensuring the correct arbor is selected for each caliber.

Simmons Universal Laser Boresighter

The universal model typically uses a magnetic attachment system or a single adjustable arbor. Securely attach the boresighter to the muzzle, ensuring proper alignment with the bore axis. Refer to the included manual for model-specific instructions.

Maintenance and Storage

Battery Care

Remove the batteries from the boresighter when not in use to prevent corrosion and battery leakage. Store batteries in a cool, dry place.

Cleaning

Clean the boresighter lens and body with a soft, dry cloth. Avoid using solvents or abrasive cleaners, as they can damage the optics. Keep the arbors clean to ensure a proper fit.

Storage

Store the boresighter and arbors in a protective case to prevent damage and contamination. Keep them in a cool, dry place away from direct sunlight and extreme temperatures.

Legal Considerations

Always comply with all applicable laws and regulations regarding firearm handling and storage. Be aware of any restrictions on laser devices in your area. Using a laser boresighter responsibly is paramount for safe firearm operation.

Alternative Boresighting Methods

Visual Boresighting

This method involves removing the bolt (if possible) and visually aligning the scope with a target through the bore. It's a simple technique, but it's less precise than laser boresighting.

Mechanical Boresighting Tools

These tools use physical alignment rods to center the scope with the bore. They can be more accurate than visual boresighting, but they require a specific tool for each caliber.

Advanced Boresighting Techniques

Using a Boresighting Target

A boresighting target includes pre-marked grids to aid in making scope adjustments. These targets can help to visualize the necessary adjustments and improve accuracy.

Accounting for Ballistic Drop

While boresighting, consider the approximate ballistic drop of your ammunition at the target distance. Adjust the scope slightly to compensate for this drop, especially at longer distances.

Conclusion: Key Takeaways

The Simmons laser boresighter is a tool for preliminary scope alignment, not a replacement for live firing. Always prioritize safety by ensuring the firearm is unloaded. Select the appropriate arbor for your caliber. Adjust the scope turrets to align the reticle with the laser dot. Remember to fine-tune your zero at the range with live ammunition. Proper maintenance and storage will extend the lifespan of your boresighter.