Installing an A2 rear sight can seem daunting, but with the right tools and technique, it's a manageable task. This guide will walk you through the process, covering everything from choosing the right installation tool to troubleshooting common problems. Whether you're a seasoned AR-15 builder or a first-time assembler, this information will help you achieve a secure and properly functioning rear sight.
Understanding the A2 Rear Sight
The A2 rear sight, a staple on many AR-15 platforms, is known for its durability and reliability. Its simple, robust design, however, necessitates a specific approach during installation to avoid damage to the sight or the upper receiver. Improper installation can lead to a loose sight, affecting accuracy and potentially causing safety issues.
Essential Tools for A2 Rear Sight Installation
While some attempt installation without specialized tools, using the correct tools is crucial for a smooth and safe process. Here's what you'll need:
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A2 Rear Sight Installation Tool: This is the most important tool. Various designs exist, but they all serve the same purpose: to securely hold the sight in place while you tighten the set screws. Look for a tool made from durable material (e.g., steel) that fits snugly against the sight's base. Avoid cheap, flimsy tools, as they can easily slip, causing damage.
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Small Screwdriver: You'll need a small, high-quality screwdriver that precisely fits the set screws on your A2 rear sight. A magnetic tip is highly recommended to prevent dropping the screws.
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Punch (optional): While not always necessary, a small punch can be helpful for aligning the sight during installation.
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Torque Wrench (recommended): Using a torque wrench helps ensure you don't over-tighten the set screws, potentially stripping them or damaging the sight. Consult your sight's instructions for the recommended torque specification.
Step-by-Step A2 Rear Sight Installation
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Prepare the Upper Receiver: Ensure your upper receiver is clean and free of debris. A clean working environment will minimize the chance of introducing contaminants that could impede proper function.
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Align the Sight: Carefully position the A2 rear sight onto the upper receiver's rear sight base. Make sure it's properly aligned and seated. A punch can be helpful for subtle adjustments.
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Secure the Sight with the Installation Tool: This is where the specialized tool comes into play. Insert the tool into the rear sight's mounting slots, securely clamping it in place. This prevents the sight from moving during tightening.
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Tighten the Set Screws: Using your appropriate screwdriver, carefully tighten the set screws. Do not overtighten. Use the torque wrench if you have one to ensure you're within the recommended range.
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Inspect the Installation: Once the set screws are tightened, carefully inspect the installation. The sight should be firmly seated and aligned correctly. Try gently rocking the sight to ensure it's not loose.
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Test the Function: After ensuring the sight is securely mounted, test its functionality. Cycle the weapon's charging handle and visually inspect its alignment again. Make sure the sight adjusts smoothly and locks securely in both the up and down positions.
Troubleshooting Common Issues
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Sight is Loose: This likely indicates either insufficient tightening of the set screws or incorrect alignment during installation. Re-check the tightness and realign if necessary.
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Set Screws are Stripped: This is usually caused by over-tightening. If this happens, you may need to replace the sight or carefully attempt to repair the stripped screws (a task best left to experienced gunsmiths).
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Sight is Misaligned: This can result from improper initial alignment. Remove the sight and repeat the installation process, paying careful attention to its placement.
Choosing the Right A2 Rear Sight Installation Tool
The market offers various A2 rear sight installation tools. While some are simpler and less expensive, others offer more robust construction and features. Consider factors like material, build quality, and ease of use when making your selection. Look for reviews from other users to guide your decision.
Remember, safety is paramount. Always handle firearms responsibly and follow all applicable safety regulations. If you're unsure about any aspect of this process, consult with a qualified gunsmith. This guide provides information but does not replace professional advice.
