Are you a shotgun owner who values precision, efficiency, and saving valuable ammunition?

Do you find yourself asking, "What's the best way to accurately zero my 20-gauge shotgun?" or "How can I quickly set up my new scope or red dot sight without wasting a box of shells at the range?" If so, the Sightmark SM39008 20 Gauge Laser Boresighter is engineered precisely for your needs. This essential tool simplifies the zeroing process, allowing you to achieve remarkable accuracy before you even fire a shot, transforming how you prepare for hunting season, competitive shooting, or simply ensuring your home defense shotgun is ready at a moment's notice.

Unlocking Precision: What is a Laser Boresighter and Why Do You Need One?

A laser boresighter is a critical piece of equipment for any firearm enthusiast dedicated to accuracy and efficiency. At its core, it's a device that projects a precise laser beam down the barrel of your firearm, simulating the bullet's path. By aligning your optic (scope, red dot, or even iron sights) with this laser dot, you can achieve an initial zero without firing a single round. This preliminary alignment, often called "getting on paper," drastically reduces the time and ammunition required for final zeroing at the range.

For 20-gauge shotgun owners, specifically, the Sightmark SM39008 offers a tailored solution. Unlike universal arbor-style boresighters that can be cumbersome and less precise, this cartridge-style boresighter is designed to chamber directly into your shotgun's breach, just like a standard shell. This ensures perfect alignment with the bore axis, providing an unparalleled level of accuracy for initial zeroing. It's an indispensable tool for anyone who frequently swaps optics, travels with their firearm, or simply wants to ensure their shotgun is always ready for peak performance.

The Sightmark SM39008: Engineered for 20-Gauge Excellence

The Sightmark SM39008 is not just any laser boresighter; it's a meticulously crafted instrument designed to meet the rigorous demands of 20-gauge shotgun owners. Manufactured from durable brass, it resembles a standard 20-gauge shotgun shell, ensuring a perfect fit within the chamber. This robust construction not only guarantees longevity but also maintains the laser's precise alignment shot after shot.

Key Features that Set the SM39008 Apart:

• Precision Machined Brass Housing: This premium material ensures consistent accuracy and exceptional durability, capable of withstanding repeated use without degradation in performance. The brass body also helps protect the internal electronics from recoil and impact.
• Powerful Red Laser (Class 3A): Emits a bright, clear red laser dot that is easily visible, even in varying light conditions. This allows for quick and precise alignment of your optics or sights from distances typically found in a garage or basement.
• Caliber-Specific Design (20 Gauge): Engineered specifically for 20-gauge shotguns, eliminating the guesswork and potential for misalignment often associated with multi-caliber or universal boresighters. This ensures the laser projects exactly along the bore's central axis.
• Convenient Cartridge Style: Inserts directly into the chamber, just like a live round. This design eliminates the need for arbors, rods, or complex setup procedures, making it incredibly user-friendly.
• Optimized Power Management: Utilizes two AG3 batteries (included), providing efficient power consumption and a practical run time. The simple activation mechanism—inserting the cartridge—makes it ready to use instantly.

Whether you're mounting a new red dot sight for turkey hunting, adjusting a scope for slug accuracy, or simply performing a pre-season check on your trusted field gun, the Sightmark SM39008 empowers you to achieve a reliable zero faster and with less hassle than ever before.

Master Your Aim: A Step-by-Step Guide to Using Your Sightmark 20 Gauge Laser Boresighter

Using the Sightmark SM39008 is straightforward, even for those new to firearm accessories. Follow these simple steps to achieve a rapid, accurate preliminary zero:

1. Safety First: Always ensure your shotgun is unloaded and cleared of all ammunition. Point the muzzle in a safe direction. Treat every firearm as if it were loaded.
2. Insert Batteries: Twist the two halves of the boresighter apart and insert the two AG3 batteries according to the polarity markings. Twist the halves back together snugly to activate the laser. The laser should immediately illuminate.
3. Chamber the Boresighter: Carefully insert the Sightmark SM39008 into the chamber of your 20-gauge shotgun, just as you would a regular shell. Close the action gently. The laser beam will project from the muzzle.
4. Position Your Target: Set up a target with a clear aiming point (e.g., a crosshair, a small circle) approximately 15-25 yards away. For most shotguns, this distance is ideal for an initial zero. Ensure the target is securely placed and visible.
5. Align Your Optics: Look through your scope, red dot, or align your iron sights with the laser dot projected on the target. Adjust your optic's windage and elevation turrets until its reticle perfectly overlaps the laser dot. Make precise, small adjustments.
6. Verify Alignment: After making adjustments, step back and re-check the alignment. The reticle should be centered on the laser dot.
7. Remove the Boresighter: Carefully open the action and remove the Sightmark SM39008 from the chamber. Store it safely.
8. Final Range Validation: Head to the shooting range and fire a few rounds to confirm your zero. Make any final, minor adjustments as needed. You'll likely find yourself "on paper" immediately, saving significant time and ammunition.

This methodical approach ensures you maximize the benefits of your laser boresighter, establishing a solid foundation for pinpoint accuracy.

Who Benefits from the Sightmark SM39008? Real-World Applications

The versatility and efficiency of the Sightmark SM39008 make it an invaluable tool for a wide array of 20-gauge shotgun owners. Consider these common scenarios where this boresighter proves its worth:

• The Avid Hunter: Before deer season, turkey season, or any hunting trip, quickly verify your scope's zero after transportation or storage. It's perfect for fine-tuning a shotgun used for slug hunting or ensuring a broad spread for bird hunting at a specific range.
• The Sport Shooter: Whether competing in trap, skeet, or 3-gun, consistent sight alignment is crucial. Use the boresighter to ensure your sights or optics are perfectly aligned before practice or competition, giving you a competitive edge.
• The New Firearm Owner: For those new to shooting, the process of zeroing a firearm can be daunting and expensive. The SM39008 offers a frustration-free way to learn the basics of sight adjustment without burning through boxes of expensive ammunition.
• The Gunsmith or Enthusiast who Swaps Optics: If you frequently change scopes, red dots, or even iron sights on your 20-gauge shotgun, this boresighter will save you countless hours. It allows for rapid initial setup of any new optic.
• Home Defense Preparedness: Ensure your home defense shotgun's sights are perfectly aligned and ready for immediate deployment without needing a trip to the range for every check.
• Pre-Travel Checks: Before packing your shotgun for a hunting trip or a shooting event, a quick check with the boresighter can confirm that nothing has shifted, providing peace of mind.

In each of these situations, the Sightmark SM39008 delivers unparalleled convenience, precision, and cost-effectiveness, cementing its status as an essential accessory for any serious 20-gauge owner.

Why Invest in a Laser Boresighter? Tangible Benefits and Unique Value

The decision to acquire a laser boresighter, particularly a dedicated 20-gauge model like the Sightmark SM39008, offers a multitude of advantages that go beyond simple convenience. These are the quantifiable benefits that make it a smart investment:

• Significant Ammunition Savings: This is perhaps the most immediate and impactful benefit. By getting your shotgun "on paper" without firing a shot, you eliminate the need to expend multiple rounds just to get a general idea of where your shots are landing. This translates directly to saved money and more rounds available for actual practice and skill development.
• Unparalleled Time Efficiency: Traditional boresighting methods, or purely range-based zeroing, can be time-consuming. The Sightmark SM39008 allows you to perform an initial zero in minutes, often from the comfort of your home or workshop, before even stepping foot on a range.
• Enhanced Accuracy and Confidence: Knowing that your initial zero is precisely aligned builds confidence. This foundational accuracy allows you to focus on shooting fundamentals at the range, rather than struggling to find the target. It's about building consistent, repeatable results.
• Versatility in Zeroing Environments: Unlike live-fire zeroing, a laser boresighter can be used indoors, in low-light conditions, or at distances that might be impractical at a typical range. This flexibility means you can prepare your firearm under almost any circumstance.
• Durability and Longevity: Constructed from high-quality brass, the SM39008 is built to last. It's a one-time investment that will serve you for years, maintaining its precision and functionality.
• Promotes Safe Firearm Handling: By allowing for dry-fire sight adjustments, the boresighter reduces the need for live-fire exercises during initial setup, emphasizing safe handling procedures without the added pressure of live rounds.

Compared to traditional methods, which might involve using a collimator, an optical boresighter, or simply "Kentucky windage" at the range, the cartridge-style laser boresighter offers superior ease of use and direct-barrel alignment. While optical boresighters rely on a series of mirrors and lenses, and collimators can be less precise due to their distance from the bore, the in-chamber design of the SM39008 ensures the laser is perfectly coaxial with the barrel, providing a true and reliable bore axis reference point.

Maintaining Your Precision Tool: Care and Storage

To ensure your Sightmark SM39008 20 Gauge Laser Boresighter continues to deliver reliable performance for years to come, proper care and storage are essential:

• Remove Batteries After Use: Always remove the AG3 batteries from the boresighter when it's not in use. This prevents battery drain and mitigates the risk of corrosion, which can damage the internal components.
• Keep It Clean: Periodically wipe down the brass housing with a soft, dry cloth to remove any residue or fingerprints. Avoid harsh chemicals or abrasives.
• Store in a Protective Case: Store the boresighter in its original packaging or a small, padded case to protect it from dust, moisture, and accidental drops.
• Handle Gently: While durable, avoid dropping the boresighter or subjecting it to excessive force, as this could affect its internal alignment and laser precision.

By following these simple guidelines, you can prolong the life and accuracy of your Sightmark laser boresighter.

Frequently Asked Questions (FAQ)

Here are answers to some common questions about laser boresighters and the Sightmark SM39008:

Q: Is the Sightmark SM39008 accurate enough for hunting or competitive shooting?
A: Absolutely. While a laser boresighter provides an excellent preliminary zero, it's crucial to follow up with live-fire validation at the range to confirm and fine-tune your zero for specific ammunition and distances. It gets you "on paper" quickly, saving time and ammo, allowing you to focus on the final precise adjustments.

Q: Can I use this boresighter for other shotgun gauges or rifle calibers?
A: No. The Sightmark SM39008 is specifically designed and calibrated for 20-gauge shotguns. Its dimensions are precise to fit the 20-gauge chamber, ensuring optimal alignment. Using it with other gauges or calibers would not provide accurate results.

Q: How far can the laser beam be seen?
A: The bright red laser is typically visible up to 100 yards at night and 25 yards in daylight conditions, depending on ambient light. For initial zeroing, distances of 15-25 yards are recommended for best accuracy and visibility.

Q: What type of batteries does the SM39008 use, and how long do they last?
A: It uses two AG3 button cell batteries (included). Battery life can vary depending on usage, but typically offers several hours of continuous operation. It's always a good idea to have spare batteries on hand. Remember to remove them after each use to prolong their life.

Q: Do I still need to go to the shooting range after using the boresighter?
A: Yes, definitely. A laser boresighter provides a crucial starting point by aligning your optics with the barrel's bore. However, factors like ammunition variations, barrel harmonics, and parallax cannot be accounted for by a boresighter alone. Live-fire testing at the range is essential to achieve a perfect, field-ready zero for your specific setup and ammunition.

Get Yours Today at DEGuns

Ready to revolutionize your 20-gauge shotgun's zeroing process? The Sightmark SM39008 20 Gauge Laser Boresighter (UPC: 810119010070) is available at DEGuns, your trusted source for premium firearm accessories. Invest in precision, save ammunition, and gain the confidence that comes with a perfectly sighted firearm.

Product Specifications

Feature	Detail
Product Model	SM39008
Caliber	20 Gauge
Laser Type	Red Laser (Class 3A)
Wavelength	632-650 nm
Output Power	<5 mW
Material	Brass
Battery Type	2x AG3 (Included)
Battery Life	Up to 1 Hour (Continuous)
Dot Size	2 inches at 100 yards
UPC	810119010070