The AR-15 platform's versatility is legendary, and nowhere is this more apparent than in the realm of optic choices. Many shooters find the combination of a magnified scope and a red dot sight incredibly advantageous, creating a setup capable of handling both close-quarters engagements and longer-range precision shots. This guide explores the intricacies of mounting a red dot sight on top of an AR-15 scope, addressing common concerns, optimal setups, and considerations for selecting the right equipment.
Why Combine a Scope and Red Dot?
The synergy between a magnified scope and a red dot sight offers significant advantages for AR-15 users:
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Versatile Engagement Ranges: A magnified scope excels at longer ranges, providing the precision needed for accurate shots at distance. The red dot, however, shines at close to medium ranges, offering quick target acquisition and instinctive shooting. This combination eliminates the need to switch between optics depending on the engagement distance.
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Rapid Target Acquisition: In close-quarters scenarios, the speed and simplicity of acquiring a target with a red dot are invaluable. The magnified scope's reticle can be less intuitive at close range, making the red dot a crucial addition for immediate response.
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Improved Situational Awareness: Maintaining situational awareness is crucial. While using the magnified scope, the shooter can still utilize the red dot for quick glances at the surrounding area without losing sight of their primary target.
Choosing the Right Components: Scope, Red Dot, and Mount
Selecting the right components is paramount for a successful setup. Several key factors influence your choices:
1. The Magnified Scope:
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Magnification: Consider the typical ranges you'll be engaging at. A lower magnification (e.g., 3-9x) is suitable for more versatile use, while higher magnification (e.g., 6-24x) is best for long-range precision. Avoid overly high magnification unless you consistently shoot at extreme distances.
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Reticle: Choose a reticle suitable for your shooting style and intended use. Mil-dot or BDC reticles are popular choices for longer ranges, offering ranging and holdover capabilities.
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Objective Lens Diameter: A larger objective lens gathers more light, improving low-light performance. Consider this factor, especially if you frequently shoot in low-light conditions.
2. The Red Dot Sight:
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Dot Size: A smaller dot is beneficial for precision, while a larger dot is better for faster target acquisition. Consider your shooting style and typical engagement ranges when choosing the dot size.
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Battery Life: Long battery life is critical, especially for extended shooting sessions. Look for red dots with reputable battery life.
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Durability: The red dot will likely experience recoil forces, so choose a rugged and durable model that can withstand the abuse.
3. The Mounting System:
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Absolute Co-Witness: This configuration allows you to use both the iron sights and the red dot simultaneously. Useful for backup sighting systems in case of optic failure.
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Lower 1/3 Co-Witness: The red dot sits slightly below the iron sights, allowing a clearer view of the red dot without obscuring the iron sights.
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Mount Height: Ensure the chosen mount correctly positions the red dot for proper eye relief and comfortable shooting. An improperly mounted red dot can lead to significant discomfort and reduced accuracy.
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Mount Material: High-quality aluminum mounts are generally recommended for their durability and strength.
Mounting the Red Dot: A Step-by-Step Guide
Precise mounting is critical for proper zeroing and consistent shot placement. Consult your specific scope and red dot manuals for detailed instructions. The general steps usually include:
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Securely attach the mount to the scope: Ensure the mount is firmly attached and aligned correctly.
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Mount the red dot to the mount: Follow the manufacturer's instructions carefully to ensure a secure and properly aligned attachment.
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Zero the red dot: Begin by zeroing the red dot at a closer range, adjusting windage and elevation until the point of impact matches the point of aim.
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Zero the scope: Once the red dot is zeroed, zero the magnified scope at your desired ranges.
Conclusion: Optimize Your AR-15 Setup
Combining a magnified scope and a red dot on your AR-15 significantly enhances your shooting capabilities, offering versatility and efficiency across various engagement ranges. By carefully selecting the right components and paying close attention to mounting, you can create a setup that optimizes your accuracy, speed, and overall performance. Remember to always prioritize safety and practice proper firearm handling techniques.
