The seemingly insignificant AR-15 rear takedown pin spring plays a crucial role in the reliable function of your firearm. Understanding its purpose, potential issues, and replacement methods is essential for any AR-15 owner. This comprehensive guide delves into everything you need to know about this vital component.
Understanding the Role of the Rear Takedown Pin Spring
The rear takedown pin spring is a small, coiled spring located within the lower receiver of your AR-15. Its primary function is to retain the rear takedown pin in place. This seemingly simple task is critical for the rifle's overall stability and functionality. Without a properly functioning spring, the rear takedown pin can become loose, leading to a variety of problems, including:
- Difficulty Field Stripping: The most immediate issue is the inability to easily disassemble the rifle for cleaning or maintenance. A loose pin makes removal difficult and frustrating.
- Reduced Accuracy: A loose rear takedown pin can affect the alignment of the upper and lower receivers, leading to potential accuracy issues. While subtle, this misalignment can impact precision over time.
- Malfunctions During Operation: In extreme cases, a completely missing or broken spring could cause the rear takedown pin to fall out during firing, rendering the rifle inoperable and potentially dangerous.
Identifying Problems with Your Rear Takedown Pin Spring
Several signs indicate a problem with your AR-15's rear takedown pin spring. These include:
- Loose Rear Takedown Pin: The most obvious sign is a rear takedown pin that moves freely or feels loose within its hole. This indicates the spring is either weak, broken, or missing entirely.
- Difficulty Removing the Rear Takedown Pin: If you struggle to remove the rear takedown pin during field stripping, the spring may be excessively strong or the pin may be binding due to dirt or debris.
- Unintentional Removal of the Rear Takedown Pin: If the rear takedown pin falls out unexpectedly, this is a clear indication of a severely weakened or broken spring.
Replacing the AR-15 Rear Takedown Pin Spring: A Step-by-Step Guide
Replacing the rear takedown pin spring is a relatively straightforward process, but requires careful attention to detail. Always ensure your firearm is unloaded and cleared before undertaking any maintenance.
What you'll need:
- Replacement Spring: Obtain a high-quality replacement spring from a reputable firearms parts supplier. Using a substandard spring could lead to recurring problems.
- Small Punch or Pin: A small punch or pin can help to gently tap the rear takedown pin out if needed.
- Appropriate sized screwdriver or punch: to remove the takedown pin.
Steps:
- Field Strip Your AR-15: Follow the standard field stripping procedure for your specific rifle model to separate the upper and lower receivers.
- Remove the Rear Takedown Pin: Carefully remove the rear takedown pin using a punch or other appropriate tool.
- Inspect the Old Spring: Examine the old spring for any signs of breakage, deformation, or excessive wear.
- Install the New Spring: Carefully install the new spring into the lower receiver, ensuring it is properly seated in its designated location.
- Reinstall the Rear Takedown Pin: Insert the rear takedown pin back into its hole.
- Reassemble Your AR-15: Reassemble your AR-15, following the reverse of the field stripping procedure.
- Test Functionality: Test the functionality of the rear takedown pin, ensuring it remains firmly in place and can be easily removed and replaced.
Choosing the Right Replacement Spring
When choosing a replacement spring, prioritize quality over price. A cheap or low-quality spring may not provide the necessary tension, leading to recurring issues. Consider purchasing your replacement spring from a reputable firearms parts supplier to ensure you receive a reliable and durable product.
Conclusion
The AR-15 rear takedown pin spring, though small, is a critical component for the reliable operation of your firearm. Regular inspection and timely replacement when necessary are crucial steps in maintaining your AR-15's functionality and safety. By following the steps outlined above, you can easily replace this small but important part and keep your rifle running smoothly. Remember, safety is paramount; always handle your firearm responsibly and ensure it is unloaded before performing any maintenance.
