Mounting a scope on your AR-15 can significantly enhance your shooting accuracy and precision. This process, while seemingly straightforward, requires careful attention to detail to ensure a secure and reliable setup. This comprehensive guide will walk you through each step, offering tips and tricks for a successful scope mounting experience.
Choosing the Right Scope Mount for Your AR-15
The first crucial step is selecting the appropriate scope mount. The wrong mount can lead to zeroing issues, scope damage, and even safety hazards. AR-15 scope mounts are typically categorized by their height and mounting system.
Mount Height
- Low Profile Mounts: These sit close to the receiver, ideal for use with iron sights and offer a lower profile. However, they may obstruct the use of some back-up iron sights (BUIS).
- Medium Height Mounts: A good compromise offering sufficient clearance for most BUIS and scopes.
- High Profile Mounts: Provide maximum clearance, essential for larger scopes or those with high objective lenses. They typically require the removal of BUIS.
Mounting Systems
- Picatinny/Weaver Rails: The most common mounting system on AR-15s, using a standardized rail system for attaching mounts and accessories. Ensure your scope rings are compatible with this system.
- Direct Mount (One-Piece): These mounts directly attach to the upper receiver, eliminating the need for separate rings. They are known for their rigidity and strength.
Consider these factors when choosing a mount:
- Scope Size and Weight: A heavier scope requires a more robust mount capable of handling the added weight and recoil.
- Shooting Position: If you primarily shoot from a benchrest, a lower mount might be preferable. For tactical shooting, a higher mount allowing for proper cheek weld might be necessary.
- Budget: Mounts range in price from budget-friendly options to high-end, precision-engineered models.
Tools and Materials Needed
Before starting, gather all the necessary tools and materials:
- AR-15 with Picatinny Rail: Ensure your rifle is unloaded and cleared.
- Scope: The scope you intend to mount.
- Scope Mount: Chosen based on the factors discussed above.
- Scope Rings (if not using a one-piece mount): These must match the diameter of your scope tube.
- Torque Wrench: Crucial for tightening screws to the manufacturer's specified torque to prevent damage.
- Allen Wrenches: Various sizes, depending on the mount and scope rings.
- Gunsmithing Screwdriver: For those who prefer not to use a torque wrench, a gunsmithing screwdriver provides better control over the application of force.
- Eye Protection: Always wear safety glasses when working with firearms and tools.
- Cleaning Kit: To remove any debris or grit before mounting.
Step-by-Step Guide to Mounting a Scope on an AR-15
1. Prepare the Rifle: Ensure the rifle is unloaded and safe. Clean the Picatinny rail thoroughly to remove any dust, debris, or oil that could interfere with a secure mount.
2. Attach the Scope Mount: Align the scope mount with the Picatinny rail on your AR-15's upper receiver. Carefully slide it forward until it’s fully seated. Ensure the mount is flush with the rail.
3. Secure the Scope Mount: Using your torque wrench, tighten the mounting screws to the manufacturer's recommended torque specifications. Do not overtighten. Overtightening can damage the mount or the upper receiver.
4. Mount the Scope Rings (If Applicable): If using separate rings, place them onto the mount. Ensure they are correctly aligned and seated. Then, carefully place the scope into the rings.
5. Secure the Scope: Tighten the scope ring screws using the torque wrench, again adhering to the manufacturer's specifications. Ensure the scope is centered and securely held within the rings.
6. Verify Alignment: Look through the scope and ensure it is aligned properly. Make minor adjustments if necessary.
7. Test Fire (At a Range): Before using in the field, test fire your rifle at the range to verify zero and ensure everything is functioning correctly.
Troubleshooting Common Scope Mounting Issues
- Scope is not level: This is often caused by an improperly aligned mount or rings. Recheck alignment and ensure everything is seated correctly.
- Scope is loose: This could be due to under-tightened screws. Double-check torque and re-tighten as needed.
- Scope is canted: This indicates a problem with the mounting system, likely misaligned rings or mount. Re-evaluate the entire mounting process.
Conclusion
Mounting a scope on your AR-15 is a crucial step in optimizing its accuracy and usability. By following these steps and paying close attention to detail, you'll ensure a secure and reliable setup. Remember to always prioritize safety and use the proper tools and techniques. Always consult your scope and mount manufacturer's instructions for specific recommendations. Enjoy your upgraded AR-15!