A boresighter is a device used to align the sights of a firearm with its bore, providing an initial, approximate zero. This process involves inserting the device into the barrel or attaching it to the muzzle of the firearm. The user then adjusts the firearm’s sights (scope, iron sights, etc.) to match the reference point projected by the boresighter. For example, a laser boresighter projects a beam onto a target, and the sights are adjusted until they align with the laser dot.
The practice offers significant advantages in terms of time and ammunition conservation. Instead of expending numerous rounds attempting to initially zero a firearm at the range, a boresighter allows for a close approximation to be achieved before live firing. This significantly reduces the number of shots required for final zeroing, saving both resources and time. Historically, this technique has been employed by gunsmiths and marksmen to streamline the sighting process and improve accuracy.
The subsequent sections will delve into the different types of boresighters available, detailed instructions on their proper application, and essential considerations for achieving optimal alignment and accuracy. Understanding these aspects is critical for effectively employing the device and maximizing its benefits.
1. Caliber Compatibility
Caliber compatibility represents a foundational element in the correct and effective employment of a bore sight. The bore sight’s design is specific to the firearm’s bore diameter; therefore, using an incompatible bore sight is not only ineffective but can also potentially damage the firearm’s barrel or the bore sight itself. Attempting to use a bore sight designed for a .223 Remington cartridge in a .308 Winchester rifle, for example, will result in an improper fit, rendering any alignment attempts meaningless and potentially causing the device to become lodged in the bore. The physical dimensions of the cartridge chamber and bore directly dictate the bore sight’s required size and shape, making proper caliber matching an indispensable prerequisite.
The use of an incorrect bore sight can lead to inaccurate initial sighting, negating the time-saving benefits the device is intended to provide. Imagine a scenario where a user mistakenly employs a bore sight slightly smaller than the rifle’s actual caliber. While it might be possible to insert the device, the resulting alignment will be skewed, causing the shooter to make incorrect sight adjustments based on a false reference point. This, in turn, leads to wasted ammunition and frustration at the range, as the firearm’s point of impact will deviate significantly from the intended target. Furthermore, forcing a bore sight into a barrel it is not designed for can damage the rifling, permanently affecting the firearm’s accuracy.
In summary, verifying caliber compatibility before using a bore sight is not merely a suggestion but a critical step in ensuring accurate initial sighting and preventing damage to the firearm. Failure to adhere to this fundamental principle will invariably result in inaccurate results, wasted resources, and potential harm to the firearm. Diligent attention to this detail is crucial for maximizing the benefits and minimizing the risks associated with boresighting.
2. Device insertion
Proper device insertion is a critical component of the boresighting process. The method by which the device is placed within or attached to the firearm directly influences the accuracy of the subsequent alignment. Incorrect insertion introduces errors that propagate through the entire sighting procedure, rendering the final result unreliable. For example, if a chamber-type bore sight is not fully seated within the chamber, or if a magnetic bore sight is not correctly aligned on the muzzle, the projected reference point will be offset, causing inaccurate sight adjustments. The interface between the device and the firearm must be secure and consistent to ensure reliable alignment.
The specific technique for device insertion varies depending on the type of bore sight being used. Chamber-type bore sights typically require careful seating in the chamber, mimicking the placement of a cartridge. Muzzle-mounted magnetic bore sights necessitate ensuring proper alignment with the bore axis. Arbor-type bore sights demand careful fitting of the correct arbor into the barrel. Each method requires adherence to the manufacturer’s instructions to avoid damage to the firearm or the bore sight. Furthermore, the absence of proper cleaning of the barrel before device insertion can introduce debris or residue, leading to inconsistent placement and subsequent alignment errors.
In conclusion, the seemingly simple act of inserting the bore sight is, in reality, a crucial step with significant implications for overall accuracy. Errors at this stage undermine the entire process, leading to wasted time and ammunition. Proper adherence to the manufacturer’s instructions, combined with careful attention to detail and cleanliness, ensures that the bore sight is correctly positioned, providing a reliable reference point for accurate sight alignment. This fundamental step directly impacts the effectiveness of the boresighting procedure and the ultimate accuracy of the firearm.
3. Target distance
Target distance, in the context of boresighting, is not arbitrary but a carefully considered factor directly impacting the precision of the initial sight alignment. Selection of an appropriate target distance is crucial for minimizing angular error and achieving a reasonably accurate zero prior to live firing. The chosen distance dictates the relationship between minute adjustments to the sights and the resulting shift in the projected point of impact.
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Magnification and Resolution
Higher magnification scopes necessitate shorter target distances during boresighting. At extreme distances, even minute misalignments are amplified, making precise adjustments problematic. The resolution of the human eye and the quality of the scope optics also play a role; lower resolution limits the ability to discern fine deviations, thereby reducing the effectiveness of boresighting at longer ranges. For instance, a high-powered scope used for long-range shooting may be best boresighted at 25 yards.
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Cartridge Trajectory
The trajectory of the cartridge influences the selection of target distance. Boresighting aims to provide an initial alignment reasonably close to the ballistic curve of the projectile. Therefore, cartridges with significantly different trajectories may benefit from varying target distances during this initial process. A cartridge with a flatter trajectory allows for a longer boresighting distance without excessive deviation from the line of sight at the intended zeroing distance.
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Environmental Factors
Ambient lighting and visibility impact the effectiveness of boresighting, especially when using laser bore sights. Bright sunlight can wash out the laser dot, making it difficult to see and align the sights accurately. Conversely, low-light conditions enhance visibility but can introduce parallax errors if not carefully managed. Selecting a target distance that balances these environmental factors is crucial. The ideal distance enables a clear and discernible reference point without introducing undue parallax.
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Bore Sight Type
The type of bore sight being employed affects the optimal target distance. Chamber-type bore sights, due to their inherent accuracy, can sometimes facilitate slightly longer target distances compared to muzzle-mounted magnetic types, which are more prone to minor misalignment. Laser bore sights, projecting a visible beam, generally require shorter distances for ease of alignment, while optical bore sights, relying on visual alignment through the bore, may accommodate slightly longer distances depending on the user’s visual acuity.
In conclusion, the selection of an appropriate target distance is an integral aspect of the boresighting process. Consideration of factors such as scope magnification, cartridge trajectory, environmental conditions, and bore sight type is essential for maximizing accuracy and minimizing wasted resources during the subsequent live-fire zeroing process. This careful consideration translates directly into improved efficiency and a more refined final zero.
4. Sight adjustment
Sight adjustment constitutes a critical phase within the process of boresighting, directly influencing the final accuracy of the firearm. Following the insertion of the bore sight and establishment of the target distance, the operator must manipulate the firearm’s sights to align with the reference point projected by the bore sight. This alignment is the tangible outcome of boresighting, representing the initial, albeit approximate, zero. Incorrect sight adjustment nullifies the benefits of boresighting, rendering the subsequent live-fire zeroing process more complex and time-consuming.
The type of sights employed (iron sights, optical scopes, red dot sights) dictates the specific adjustment mechanisms. Iron sights typically involve adjusting rear and front sight elements, while optical scopes utilize turrets to control elevation and windage. Red dot sights employ similar adjustment mechanisms, often with smaller increments. In each case, precise adjustments, following the manufacturer’s instructions, are essential. For instance, if a bore sight projects a laser dot two inches to the right and one inch below the intended point of impact, the operator must adjust the firearm’s sights to bring the point of impact to coincide with the laser dot. Ignoring this step, or performing it inaccurately, results in a misaligned sighting system. Furthermore, it is important to consider the “clicks” of the scope or sights and calculate it properly.
Successful sight adjustment during boresighting necessitates a stable platform and attention to detail. Any movement or instability during the adjustment process introduces errors. The operator must also be aware of parallax, especially when using optical scopes, ensuring the eye is centered within the scope’s field of view to minimize alignment errors. A final check of the alignment, after all adjustments are made, confirms the accuracy of the process. Correct sight adjustment, guided by the bore sight’s reference point, represents the culmination of the boresighting process, laying the groundwork for an efficient and accurate live-fire zeroing procedure.
5. Stable platform
A stable platform constitutes a fundamental requirement for effective boresighting. Any movement or instability during the process introduces inconsistencies that negate the accuracy gains sought by utilizing a bore sight. The stability of the firearm directly impacts the reliability of the alignment between the bore and the sighting system.
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Minimizing Angular Displacement
Angular displacement, even in minute increments, significantly affects the projected point of impact, particularly at longer target distances. A wobbly or unstable platform introduces random angular deviations during sight adjustment, making it impossible to achieve precise alignment. For instance, if a rifle is resting on an unsteady support, the barrel will inevitably shift slightly as adjustments are made, rendering the alignment inaccurate. A stable platform minimizes these angular displacements, ensuring that adjustments accurately reflect the relationship between the bore and the sights.
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Repeatability and Consistency
Repeatability is essential for verifying the accuracy of boresighting adjustments. A stable platform allows for consistent and repeatable measurements, ensuring that the alignment process is reliable. If the firearm is not stable, each adjustment will produce a slightly different result, making it impossible to confirm the accuracy of the alignment. A solid rest, such as a benchrest or tripod, enables the operator to return the firearm to the exact same position after each adjustment, facilitating repeatable measurements and consistent results. The ability to repeatedly confirm alignment is directly dependent on the stability of the platform.
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Reducing Human Error
Human error is inherently present in any manual alignment process. However, a stable platform minimizes the impact of human error by reducing the need for constant correction and stabilization. When the firearm is securely supported, the operator can focus on making precise adjustments to the sights without simultaneously struggling to maintain stability. This reduces fatigue and allows for more careful and deliberate adjustments, improving the overall accuracy of the boresighting process. A stable platform effectively reduces the cognitive load on the operator, allowing for a more precise and error-free alignment.
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Maximizing Bore Sight Effectiveness
The benefits of using a bore sight are only realized when the firearm is held stable. Without a stable platform, the inherent accuracy of the bore sight becomes irrelevant, as inconsistencies introduced by movement overshadow any potential gains. Whether using a laser, magnetic, or chamber bore sight, a steady rest is necessary to view the light and make the appropriate adjustments to the windage and elevation.
In summary, the implementation of a stable platform during boresighting is not merely a procedural recommendation, but a fundamental requirement for achieving accurate and reliable results. By minimizing angular displacement, ensuring repeatability, reducing human error, and maximizing the effectiveness of the bore sight, a stable platform directly contributes to a more efficient and precise alignment process, ultimately leading to improved firearm accuracy.
6. Ambient lighting
Ambient lighting, the surrounding light present during the use of a bore sight, significantly influences the accuracy and efficiency of the sighting process. Its effect varies based on the type of bore sight utilized and the nature of the environment. Proper consideration of ambient lighting conditions is crucial for optimal bore sight performance.
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Laser Boresight Visibility
Laser bore sights are particularly susceptible to ambient lighting conditions. In bright daylight, the laser beam’s visibility can be significantly reduced, making it challenging to align the firearm’s sights accurately. High levels of ambient light diminish the contrast between the laser dot and the target, requiring the operator to seek shaded areas or reduce the target distance to enhance visibility. Conversely, in low-light conditions, the laser beam is more easily visible, allowing for longer target distances. However, excessive darkness can introduce parallax errors or strain the eyes, reducing precision. The selection of an appropriate target distance and ambient lighting balance is necessary for optimal laser bore sight effectiveness.
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Optical Boresight Clarity
Optical bore sights, which rely on visual alignment through the firearm’s bore, are also affected by ambient lighting. Insufficient light reduces the clarity of the target image, hindering the operator’s ability to accurately align the crosshairs or reticle. Excessive light, particularly direct sunlight, can cause glare and washout, similarly reducing visibility. The ideal ambient lighting for optical bore sights provides sufficient illumination to clearly view the target image without introducing glare or excessive contrast. Shaded areas or indirect lighting are often preferable.
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Color Perception and Contrast
Ambient lighting influences color perception and contrast, affecting the ability to distinguish the bore sight’s reference point from the target. Certain wavelengths of light can distort colors, making it difficult to accurately align the sights. For example, using a red laser bore sight under red-tinted lighting can reduce the contrast between the laser dot and the target, making alignment challenging. Neutral or balanced lighting conditions are generally preferable for accurate color perception and contrast.
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Environmental Glare and Reflections
Environmental glare and reflections can interfere with the boresighting process, creating visual distractions and obscuring the target. Reflective surfaces, such as water or shiny objects, can redirect light, creating glare that impairs visibility. Reducing glare and reflections through the use of shade, filters, or alternative target placement is essential for maintaining accuracy during boresighting. Minimizing external distraction helps improve focus and clarity.
In conclusion, ambient lighting exerts a significant influence on the use of bore sights, affecting the visibility of laser beams, the clarity of optical images, color perception, and the presence of glare. Careful consideration of these factors, and the implementation of appropriate mitigation strategies, are crucial for maximizing the accuracy and effectiveness of the boresighting process, ultimately contributing to improved firearm performance.
7. Parallax correction
Parallax correction is a critical consideration when employing a bore sight, particularly when using optical sights. Parallax, in optical systems, refers to the apparent shift in the position of an object when viewed from different angles. In the context of firearms, this means that if the shooter’s eye is not perfectly aligned with the optical axis of the scope, the perceived point of impact can deviate from the actual point of impact. While a bore sight provides an initial alignment of the firearm’s bore with the target, parallax error can introduce significant inaccuracies that must be addressed before live firing.
The cause-and-effect relationship is straightforward: improper parallax correction during boresighting leads to inaccurate initial sight alignment. For example, if a scope is set for parallax at 100 yards, and the bore sighting is performed at 25 yards without adjusting the parallax setting, the perceived point of impact will be shifted, causing the shooter to adjust the scope incorrectly. This necessitates more extensive and potentially wasteful live-fire adjustments to achieve a proper zero. Many modern scopes offer adjustable parallax settings, allowing the user to correct for parallax at various distances. Failing to utilize this feature when boresighting undermines the purpose of the process, as it introduces a variable that the bore sight cannot account for.
The practical significance of understanding parallax correction when using a bore sight lies in minimizing wasted ammunition and reducing the time required to achieve a precise zero. By correctly adjusting the parallax setting on the scope to match the distance at which the bore sighting is performed, the shooter eliminates a significant source of error. This ensures that the initial adjustments made based on the bore sight alignment are as accurate as possible, leading to a more efficient and effective live-fire zeroing process. In essence, neglecting parallax correction when boresighting is akin to building a house on a shaky foundation; the initial alignment may appear correct, but the underlying instability will eventually manifest as inaccuracies.
8. Confirmation shots
Confirmation shots represent an indispensable stage in the overall sighting process following the use of a bore sight. This step validates the accuracy of the initial alignment achieved through the bore sight and serves as the bridge between approximation and precise zeroing.
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Verification of Boresight Alignment
Confirmation shots provide empirical evidence of the bore sight’s effectiveness. Despite the meticulous application of a bore sight, slight discrepancies can arise due to manufacturing tolerances, environmental factors, or subtle variations in firearm components. Live-fire testing reveals these discrepancies, allowing for informed adjustments. For instance, if confirmation shots consistently group slightly to the left and high, this indicates a need for further sight adjustments beyond the initial bore sight alignment.
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Assessment of Ballistic Trajectory
Confirmation shots enable the assessment of the firearm’s ballistic trajectory under real-world conditions. Boresighting establishes a basic alignment, but it cannot account for all factors influencing bullet flight, such as wind, atmospheric pressure, and ammunition characteristics. Confirmation shots at varying distances provide data points for understanding the firearm’s trajectory, allowing for adjustments to compensate for bullet drop and wind drift. These adjustments refine the initial bore sight alignment to achieve optimal accuracy at the intended engagement distances.
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Identification of Mechanical Issues
Confirmation shots can reveal underlying mechanical issues that may not be apparent during static bore sighting. Inconsistent grouping or erratic shot placement may indicate problems with the firearm’s action, barrel, or mounting system. Addressing these mechanical issues is crucial before attempting further sight adjustments. Confirmation shots serve as a diagnostic tool, ensuring that the firearm is mechanically sound and capable of consistent performance.
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Establishment of Shooter Proficiency
While the bore sight removes the guesswork of initial alignment, confirmation shots provide an opportunity to refine the shooter’s technique. A stable shooting platform, proper breathing control, and consistent trigger pull are essential for accurate shot placement. Analyzing the results of confirmation shots allows the shooter to identify and correct any flaws in their technique, improving overall shooting proficiency. The feedback gained from live-fire testing complements the initial bore sight alignment, leading to a more accurate and consistent shooting experience.
In conclusion, confirmation shots extend beyond simple verification; they provide a holistic assessment of the firearm’s performance, ballistic trajectory, mechanical integrity, and shooter proficiency. This essential step transforms the approximate alignment achieved through boresighting into a precisely zeroed firearm, ready for accurate and consistent shot placement in real-world conditions.
9. Device removal
Device removal, while seemingly a final step in using a bore sight, possesses a direct impact on maintaining the alignment achieved. The method of removing the bore sight from the firearm directly influences the potential for disturbing the newly established zero. Premature or forceful removal can inadvertently shift the sights or disrupt the bore’s position, negating the preceding alignment efforts. For instance, a tight-fitting chamber bore sight yanked out abruptly can jostle the firearm, potentially altering the scope’s position or its internal adjustments. Therefore, careful and deliberate device removal is crucial for preserving the integrity of the initial boresighting process.
The type of bore sight dictates the appropriate removal technique. Chamber bore sights typically require a gentle, controlled extraction, often aided by a cleaning rod to avoid jarring the firearm. Muzzle-mounted magnetic bore sights should be detached with a smooth, linear motion, minimizing any lateral force that could shift the barrel. Laser bore sights, depending on their design, may require unscrewing or unclipping from the muzzle or chamber. In all cases, adhering to the manufacturer’s instructions for removal is essential. Failure to do so not only risks disturbing the sight alignment but also potentially damaging the firearm’s bore or the bore sight itself. Moreover, inspecting the bore sight for any residue or debris after removal is prudent to ensure its continued accuracy in subsequent uses.
In summary, device removal is not a mere afterthought but an integral component of effective boresighting. The care and precision exercised during this final step directly contribute to preserving the accuracy achieved and ensuring the firearm is ready for confirmation shots and live-fire zeroing. Neglecting proper removal techniques risks compromising the entire boresighting process, potentially leading to wasted time and resources at the range. Therefore, attention to detail during device removal is as important as the initial alignment efforts.
Frequently Asked Questions
The following frequently asked questions address common concerns and clarify crucial aspects related to the correct and effective use of a bore sight. These responses aim to provide clear, concise, and technically accurate information to ensure proper understanding and application.
Question 1: What are the primary benefits derived from using a bore sight?
The principal advantage lies in significantly reducing the amount of ammunition required to achieve an initial zero on a firearm. The device provides a preliminary alignment of the sights with the bore, minimizing the iterative process typically associated with live-fire zeroing. It also saves considerable time at the range.
Question 2: Is it essential to confirm caliber compatibility before using a bore sight?
Affirmative. Caliber compatibility is paramount. Using a bore sight of an incorrect caliber can lead to inaccurate alignment and potential damage to the firearm’s barrel. Proper matching of the bore sight to the firearm’s caliber is non-negotiable.
Question 3: How critical is target distance in the boresighting process?
Target distance is a significant factor influencing the accuracy of the initial sight alignment. An appropriate distance minimizes angular error, ensuring a reasonably accurate zero before live firing. Factors such as scope magnification and cartridge trajectory should inform the selection of target distance.
Question 4: What is the significance of a stable platform during boresighting?
A stable platform is essential to minimize movement and inconsistencies that can compromise the alignment process. Any instability during sight adjustment introduces errors, negating the benefits of using a bore sight. A solid rest, such as a benchrest or tripod, is highly recommended.
Question 5: How does ambient lighting affect the use of a bore sight, particularly laser models?
Ambient lighting can significantly affect the visibility of laser bore sights. Bright daylight diminishes the laser beam’s visibility, while excessive darkness can introduce parallax errors. Selecting a target distance and ambient lighting balance that enhances visibility is crucial.
Question 6: Are confirmation shots necessary after using a bore sight?
Confirmation shots are indispensable for verifying the accuracy of the initial bore sight alignment. Live-fire testing reveals any discrepancies and allows for informed adjustments, ensuring that the firearm is precisely zeroed for real-world conditions. This validates the bore sighting process.
In summary, the correct and effective use of a bore sight hinges on adherence to fundamental principles, including caliber compatibility, appropriate target distance, a stable platform, awareness of ambient lighting, and the necessity of confirmation shots. Neglecting these principles diminishes the benefits of the device and can compromise the accuracy of the firearm.
The subsequent sections will explore advanced techniques and troubleshooting tips for optimizing the boresighting process and addressing common challenges encountered in the field.
Expert Boresighting Tips
Employing a bore sight effectively requires meticulous attention to detail and adherence to established best practices. These tips offer guidance for optimizing the boresighting process and maximizing accuracy.
Tip 1: Prioritize Caliber-Specific Devices: Ensure the bore sight is precisely matched to the firearm’s caliber. Using an incorrect caliber inevitably leads to misalignment and inaccurate results. Refer to the firearm’s markings and the bore sight manufacturer’s specifications.
Tip 2: Optimize Target Distance: Select a target distance appropriate for the firearm and sighting system. Shorter distances are preferable for high-magnification scopes or when ambient light is limited. A distance of 25 yards often proves suitable for many common setups.
Tip 3: Secure a Stable Shooting Platform: Implement a robust and unwavering shooting platform during the entire boresighting procedure. Any movement or instability directly affects alignment precision. A high-quality benchrest or tripod is recommended.
Tip 4: Mitigate Ambient Light Interference: Control ambient lighting conditions to enhance visibility of the bore sight’s reference point. Shade or diffused lighting can improve laser visibility, while consistent lighting aids optical alignment. Adjust as needed based on bore sight type.
Tip 5: Address Parallax Errors Methodically: Correct for parallax if the optical sighting system offers this adjustment. Setting the parallax correctly for the boresighting distance minimizes optical distortion and ensures accurate alignment. Refer to the scope’s instructions for proper parallax adjustment.
Tip 6: Employ Gentle Device Insertion and Removal: Insert and remove the bore sight with deliberate care to avoid disturbing the firearm’s alignment. Avoid forcing the device or using abrupt motions. Smooth, controlled movements are crucial for maintaining zero.
Tip 7: Document Initial Boresight Adjustments: Record the number of clicks or adjustments made to the sighting system during the boresighting process. This data can serve as a valuable reference point during subsequent live-fire zeroing and future adjustments.
Successful implementation of these expert tips streamlines the boresighting process, minimizes wasted ammunition, and establishes a solid foundation for accurate firearm performance. By integrating these practices, precision and efficiency in sighting are significantly enhanced.
The following sections will provide information regarding troubleshooting the use of bore sights and address common problems encountered.
Conclusion
The preceding discussion has comprehensively explored the multifaceted aspects of how to use a bore sight. The analysis has underscored the importance of caliber compatibility, proper device insertion, appropriate target distance, sight adjustment techniques, the necessity of a stable platform, ambient lighting considerations, parallax correction, confirmation shots, and careful device removal. Each element contributes significantly to the overall accuracy and efficiency of the firearm sighting process. A thorough understanding of these principles is essential for maximizing the benefits of boresighting and minimizing potential errors.
The information provided serves as a foundation for both novice and experienced shooters seeking to refine their firearm zeroing procedures. Continued adherence to best practices and a commitment to precision are crucial for achieving consistent and accurate results. Mastering the art of how to use a bore sight translates directly into improved shooting proficiency and responsible firearm ownership.
