Mounting a scope on your AR-15 can significantly enhance its accuracy and long-range capabilities. However, improper mounting can lead to frustrating zeroing issues and even safety hazards. This comprehensive guide will walk you through the process, ensuring you achieve a secure and accurate scope setup.
Choosing the Right Scope Mount
Before you even think about attaching your scope, you need the right mount. AR-15 scope mounts are typically classified by their height and rail interface.
Understanding AR-15 Rail Systems
Most modern AR-15s feature a Picatinny rail system (also known as a MIL-STD-1913 rail) on the upper receiver. This rail is a standardized system with slots that allow for the secure attachment of accessories, including scope mounts.
Mount Height Considerations
The height of your mount depends on your scope's objective lens diameter and the desired eye relief. A lower mount will sit closer to the receiver, while a higher mount provides more clearance. Too low, and your cheek weld will be uncomfortable; too high, and your sight picture might be awkward. Consider the overall size of your scope and your personal preference when choosing a height. Experimentation may be needed to find the perfect fit.
Mount Types:
- Standard Mounts: These are the most common and generally offer a solid, reliable platform.
- Low-Profile Mounts: Ideal for close-quarters combat (CQB) scenarios where a lower profile is desirable.
- Extended Mounts: Offer increased eye relief for scopes with longer eye relief requirements, often used with high-power scopes.
- One-Piece Mounts: Offer a rigid, single-piece design for superior strength and stability.
- Two-Piece Mounts: More adjustable and may allow for cant adjustment (tilting the scope).
Tools and Materials You'll Need
To mount your scope successfully, gather the following:
- AR-15 Scope Mount: Choose a reputable brand like LaRue Tactical, Aimpoint, or similar.
- Scope: Ensure your scope is compatible with the chosen mount.
- Screwdriver: The correct type will depend on your mount's screws (usually Torx or Allen wrenches).
- Torque Wrench (Recommended): Over-tightening screws can damage your mount or receiver. A torque wrench ensures you apply the correct amount of pressure.
- Level: Essential for ensuring your scope is mounted perfectly level.
- Loctite (Optional but recommended): Secures the screws and prevents them from loosening over time.
Step-by-Step Scope Mounting Process
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Prepare the Mount: Carefully examine your mount and ensure all components are present and in good condition.
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Attach the Mount to the Rail: Align the mount with the Picatinny rail on your upper receiver. Ensure the mount's clamping mechanism engages securely with the rail.
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Tighten the Mount Screws: Tighten the screws evenly and firmly, using a torque wrench to avoid over-tightening. Apply a small amount of Loctite to the screws before tightening (if using).
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Mount the Scope: Carefully place the scope into the rings of the mount. Ensure it's seated correctly and the scope's objective lens is facing forward.
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Tighten the Scope Rings: Tighten the scope ring screws evenly and firmly, again using a torque wrench if available.
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Level the Scope: Use a level to ensure the scope is perfectly level both horizontally and vertically. Make any necessary adjustments to the mount or scope rings.
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Double-Check Everything: Before heading to the range, thoroughly check all screws for tightness and ensure the scope is securely mounted.
Zeroing Your Scope
Once your scope is mounted, you'll need to zero it. This process involves adjusting the scope's windage and elevation turrets to ensure your point of aim matches your point of impact. This requires ammunition, a target, and a safe shooting environment. Consult your scope's manual for specific instructions on zeroing procedures.
Safety First!
Always handle firearms responsibly and follow all safety regulations. Never point a firearm at anything you don't intend to shoot, and always keep your finger off the trigger until ready to fire.
This guide provides a comprehensive overview of how to mount a scope on an AR-15. Remember, proper mounting is crucial for accuracy and safety. If you're unsure about any step, it's always best to seek the assistance of a qualified gunsmith.
