The world of AR-15 accessories is vast, and choosing the right optic can be overwhelming. Many shooters find themselves drawn to the versatility of a red dot sight atop an AR scope, a setup often referred to as co-witnessing. This configuration offers a unique blend of close-quarters combat (CQB) capabilities and long-range precision, making it a popular choice for both competitive shooters and those seeking a versatile setup for various applications. This guide delves into the benefits, considerations, and best practices for using an AR scope with a red dot on top.
Understanding the Benefits of Co-witnessing
The primary advantage of mounting a red dot sight on top of an AR scope lies in its ability to provide a seamless transition between close-range and long-range engagements.
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Close-Quarters Combat Readiness: The red dot sight, with its fast target acquisition and instinctive aiming, excels in CQB situations. Having it readily available above the magnified scope eliminates the need to quickly switch optics or fumble with adjustments during a fast-paced encounter.
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Long-Range Precision: The magnified scope provides the accuracy and precision necessary for longer-range shots where target identification and precise bullet placement are critical. This allows for accurate engagement at distances where a red dot alone would be insufficient.
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Enhanced Situational Awareness: The lower 1/3 co-witness allows the shooter to maintain awareness of their surroundings even while using the magnified optic. The red dot's visibility through the scope's field of view offers a backup sighting solution and a quick way to reacquire the target.
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Versatility: This setup is exceptionally versatile, suitable for a wide range of shooting scenarios, from home defense to hunting to competitive shooting.
Choosing the Right Red Dot and Scope Combination
Selecting compatible optics is crucial for a successful co-witness setup. Consider these factors:
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Red Dot Sight Selection: Look for a robust, reliable red dot sight with a low profile and a clear, crisp reticle. Durability and battery life are also key considerations. Ensure the red dot is compatible with your chosen mounting system.
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AR Scope Selection: The choice of scope will depend on your specific needs and intended use. Consider magnification range, field of view, and reticle type. A scope with a generous eye relief is essential for comfortable shooting, especially with a red dot mounted on top.
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Mounting System: A quality mounting system is crucial. Ensure the rings are properly sized and appropriately secured to both the scope and the upper receiver. Proper mounting ensures a stable and reliable zero.
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Co-witness Height: Understanding lower 1/3 co-witness and absolute co-witness is important. Lower 1/3 allows you to see the red dot through the scope's field of view, while absolute co-witness means the red dot and scope's crosshairs align perfectly. The best choice depends on personal preference and shooting style.
Zeroing Your Red Dot and Scope
Proper zeroing is essential for accuracy and effective shooting. Zero the scope first at your preferred distance, followed by zeroing the red dot at a shorter range (typically 25 yards). Ensure both optics are accurately zeroed independently to prevent discrepancies and maintain accuracy across different ranges.
Potential Challenges and Solutions
While co-witnessing offers significant advantages, there are some potential challenges to consider:
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Weight and Bulk: Adding a red dot on top of a scope increases the overall weight and bulk of the setup, which can affect handling and maneuverability.
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Cost: High-quality optics can be expensive, and a co-witness setup requires two separate units.
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Eye Relief: Incorrect eye relief can make it difficult to see both the red dot and the scope's reticle clearly.
Conclusion
An AR scope with a red dot on top offers a compelling combination of close-range and long-range capabilities, making it an excellent option for many shooters. By carefully selecting compatible optics, mounting them securely, and properly zeroing the setup, you can maximize its effectiveness and enjoy the benefits of a versatile and highly adaptable aiming system. Remember, consulting with experienced shooters and professionals can help you choose the perfect setup for your specific needs and shooting style.
