The popularity of AR-15 platform rifles continues to surge, and with it, the demand for versatile and effective sighting systems. One increasingly popular setup involves mounting a red dot sight atop a magnified optic, creating a powerful co-witness system. This guide explores the advantages, considerations, and best practices for using an AR scope with a red dot on top.
Why Choose a Red Dot Over a Scope?
While magnified scopes excel at long-range accuracy, they often fall short in close-quarters combat (CQB) situations. The need for quick target acquisition at shorter distances led to the rise of red dot sights. Their advantages are undeniable:
- Speed and Simplicity: Red dots provide nearly instantaneous target acquisition, crucial in dynamic situations. No need to line up iron sights or fumble with magnification adjustments.
- Both Eyes Open Shooting: Unlike magnified scopes which require one-eye shooting, red dots allow for both-eyes-open shooting, enhancing situational awareness and peripheral vision.
- Lightweight and Compact: Red dots are generally lighter and more compact than magnified scopes, reducing weight and bulk on the firearm.
The Benefits of a Co-witness Setup
Combining a red dot with a magnified scope offers the best of both worlds:
- Optimal Versatility: Switch seamlessly between close-range engagements (red dot) and longer-range precision shots (magnified scope).
- Enhanced Situational Awareness: The red dot provides a constant backup sighting system, even when the magnified scope is in use.
- Improved Accuracy at All Ranges: The combination allows for accurate shots at both near and far distances.
Choosing the Right Red Dot and Magnified Optic
Selecting the appropriate red dot and magnified optic is crucial for a successful co-witness setup. Consider these factors:
Red Dot Selection:
- Magnification: 1x magnification is standard and ideal for co-witness setups.
- Reticle: Choose a reticle suited to your needs and shooting style (dot, circle dot, etc.).
- Mounting Height: Ensure the red dot sits high enough to allow for proper co-witness with the magnified scope. Absolute co-witness (red dot reticle aligns perfectly with the scope’s field of view) is preferred by many.
- Durability: Opt for a robust red dot capable of withstanding recoil and harsh conditions.
Magnified Optic Selection:
- Magnification Range: Consider the distances at which you'll be shooting. A variable magnification scope offers greater flexibility.
- Reticle: Choose a reticle that's clear, easy to use, and appropriate for your shooting style and environment.
- Eye Relief: Sufficient eye relief is critical for comfortable and safe shooting, especially with higher magnification scopes.
- Durability and Construction: Look for a scope made of high-quality materials and built to withstand recoil.
Mounting and Zeroing Your Co-witness System
Proper mounting and zeroing are essential for optimal performance. Use quality rings and mounts designed for your specific optic combination. Zeroing involves adjusting the sights to ensure accurate shot placement at various ranges. This often requires professional assistance or significant practice.
Absolute vs. Lower 1/3 Co-witness:
- Absolute Co-witness: The red dot reticle aligns perfectly with the magnified optic’s field of view. This provides the quickest target acquisition but can be less intuitive for some.
- Lower 1/3 Co-witness: The red dot reticle sits slightly below the magnified optic's field of view. This offers a better view of the magnified reticle when using the scope but requires a slightly slower target acquisition.
Conclusion: Mastering the AR Scope with Red Dot on Top
An AR scope with a red dot on top represents a highly effective sighting system for modern shooters. By understanding the advantages, considerations, and best practices outlined above, you can confidently build a versatile and reliable setup tailored to your specific needs and shooting style. Remember, proper training and practice are crucial to mastering any sighting system.
