Choosing the right scope mount for your AR-15 is crucial, especially if you want to retain the ability to use your iron sights. A quality mount ensures your optic is securely positioned and, critically, allows for a quick transition back to your backup iron sights if your primary optic fails or the situation demands it. This guide will walk you through the key considerations when selecting an AR-15 scope mount that maintains iron sight functionality.
Understanding the Importance of Co-Witnessing
The term "co-witnessing" refers to the ability to see both your optic and your iron sights simultaneously through the scope. This offers significant advantages:
- Redundancy: If your scope malfunctions or its battery dies, you still have a reliable sighting system.
- Close-Quarters Combat (CQC): Iron sights are often preferred for extremely close-range engagements where the magnification of a scope can hinder situational awareness.
- Rapid Target Acquisition: Quickly switching between iron sights and your optic allows for adaptability in various combat scenarios.
There are two primary types of co-witnessing:
- Absolute Co-witness: Your iron sights are perfectly aligned with the center of your optic's field of view.
- Lower 1/3 Co-witness: Your iron sights are visible just below the center of your optic's field of view. This setup usually provides a clearer sight picture through the optic.
The type of co-witnessing you choose depends on your personal preference and shooting style. Many shooters prefer lower 1/3 co-witness for its improved optic sight picture.
Types of AR-15 Scope Mounts for Co-Witnessing
Several mount types allow for co-witnessing, each with its pros and cons:
1. Standard AR-15 Scope Mounts with Integrated Iron Sights
Some mounts are designed to integrate iron sights directly into the mount itself. This eliminates the need for separate iron sights on your upper receiver, streamlining the setup. However, these often limit the height of the optic that can be used.
2. AR-15 Mounts with Adjustable Height
These mounts allow for adjustment of the optic's height, enabling you to achieve either absolute or lower 1/3 co-witness depending on the height of your iron sights and chosen optic. This offers greater flexibility.
3. Picatinny Rail Mounts
The ubiquitous Picatinny rail system provides the foundation for most AR-15 scope mounts. Choosing a mount with the appropriate height for your optic and iron sights is critical for achieving co-witness. Pay close attention to the mount's height specifications.
Key Considerations When Choosing Your Mount
- Height: This determines your co-witnessing configuration. Measure your iron sights and optic to ensure the mount provides the desired alignment.
- Material: Durable materials like aluminum alloy are crucial for withstanding recoil and maintaining zero. Look for mounts made from high-quality materials.
- Construction: A robust mount with secure locking mechanisms is essential for safety and reliable performance.
- Weight: While strength is paramount, consider the weight of the mount, especially for long-range shooting, where added weight can affect stability.
- Compatibility: Ensure the mount is compatible with both your AR-15 upper receiver and the optic you intend to use.
Conclusion: Prioritizing Safety and Functionality
Selecting the right AR-15 scope mount is vital for both performance and safety. By understanding the principles of co-witnessing and carefully considering the factors discussed above, you can choose a mount that enhances your shooting experience while providing the crucial backup of your iron sights. Remember to always prioritize safety and reliable equipment when equipping your firearm.
