Choosing the right AR-15 scope mount is crucial for accuracy and functionality, especially when you want to retain the use of your iron sights. This guide dives deep into selecting an AR-15 scope mount that allows for co-witnessing or lower 1/3 co-witnessing of your iron sights, ensuring you're prepared for any shooting situation.
Understanding AR-15 Scope Mounts and Iron Sights
The AR-15 platform's versatility stems partly from its ability to adapt to various sighting systems. Iron sights, offering a simple, reliable backup, are often preferred alongside a scope for versatility. A well-chosen scope mount facilitates this combination. Understanding the different types of mounts is key.
Types of AR-15 Scope Mounts
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Standard Mounts: These offer a direct attachment point for your scope, often placing it high above the receiver. This can obstruct the use of iron sights.
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Low Profile Mounts: Designed to keep the scope closer to the receiver, minimizing the obstruction of iron sights. These are frequently chosen for use with magnified optics.
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Co-Witness Mounts: Specifically engineered to allow for co-witnessing of both the scope and iron sights. This means you see both at the same time through the scope.
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Lower 1/3 Co-Witness Mounts: Similar to co-witness mounts, but the iron sights appear slightly lower in the scope's field of view. This provides a cleaner sight picture through the scope while still giving a ready backup sight picture.
Choosing the Right AR-15 Scope Mount with Iron Sight Capability
Several factors influence the ideal scope mount choice for your AR-15, particularly when iron sights are involved.
1. Co-Witnessing vs. Lower 1/3 Co-Witnessing
This is a crucial decision. Co-witnessing allows both the scope and iron sights to be visible simultaneously. This can be beneficial in close-quarters situations or if your scope malfunctions. Lower 1/3 co-witnessing presents a cleaner sight picture through the scope while still maintaining the iron sights as a backup. The best choice depends on personal preference and shooting style.
2. Scope Height and Eye Relief
The height of your scope mount directly affects your sight picture and cheek weld. Too low, and you might struggle to see through the scope comfortably. Too high, and your cheek weld might be uncomfortable, and you could lose sight of your iron sights. Consider your scope's eye relief requirements.
3. Mount Material and Construction
Durability is paramount. Aluminum is a common choice for AR-15 scope mounts due to its strength and lightweight nature. Look for mounts made from high-quality materials and robust construction, capable of withstanding recoil. 6061-T6 aluminum is a frequently used, high-quality material.
4. Ring Height and Scope Diameter
Ensure the rings you choose are compatible with both your scope's diameter and the desired height for co-witnessing or lower 1/3 co-witnessing. Incorrect ring height can lead to improper alignment and sighting difficulties.
5. Mount Type and Attachment Method
AR-15 scope mounts typically attach to the upper receiver using Picatinny or Weaver rails. Ensure your mount is compatible with your receiver's rail system.
Case Study: Comparing Two Popular Mounts
Let's compare two hypothetical mounts:
| Feature | Mount A (Co-Witness) | Mount B (Lower 1/3 Co-Witness) |
|---|---|---|
| Material | 6061-T6 Aluminum | 7075 Aluminum |
| Height | Medium | Low |
| Co-witnessing | Full | Lower 1/3 |
| Price | $75 | $90 |
| Weight | 6 oz | 5 oz |
Mount A, offering full co-witnessing, might be preferable for shooters prioritizing quick transitions to iron sights. Mount B, with its lower profile, provides a cleaner scope view.
Maintaining Your AR-15 Scope Mount and Iron Sights
Regular maintenance is key to ensuring reliable performance.
- Inspect your mount: Regularly check for any signs of damage or looseness.
- Clean your mount: Remove any dirt or debris that could affect its functionality.
- Tighten screws: Ensure all screws are properly tightened to prevent shifting during shooting.
- Lubricate moving parts: Some mounts have moving parts which may benefit from occasional lubrication.
Conclusion: Choosing the Right AR-15 Scope Mount with Iron Sights
Selecting the right AR-15 scope mount that allows for the use of iron sights is a crucial decision for any AR-15 owner. Understanding the differences between co-witnessing and lower 1/3 co-witnessing, considering the height, material, and construction of the mount, and paying attention to scope and ring compatibility will ensure you make an informed choice. Remember to prioritize quality and reliability for safe and effective shooting. Proper maintenance will prolong the life and effectiveness of your chosen setup.