AR-15 Hammer Pin Won’t Go In: A Comprehensive Guide

Are you struggling to insert the hammer pin into your AR-15? Don’t worry; you’re not alone. This issue is quite common among AR-15 enthusiasts. In this article, we will delve into the possible reasons behind this problem and provide you with a step-by-step guide to resolve it. Whether you’re a beginner or an experienced shooter, this guide will help you troubleshoot and fix the issue efficiently.

Understanding the Hammer Pin

The hammer pin is a crucial component of the AR-15’s hammer assembly. It is responsible for engaging the hammer with the sear, which in turn, allows the trigger to pull the hammer back and release the striker, thus firing the weapon. If the hammer pin won’t go in, it can lead to malfunctions and unsafe conditions.

Common Causes of the Problem

There are several reasons why the hammer pin might not go in. Here are some of the most common causes:

• Debris or dirt in the hammer pin hole

• Improperly sized hammer pin

• Hammer pin is bent or damaged

• Excessive force or incorrect technique while inserting the hammer pin

Diagnosing the Issue

Before attempting to fix the problem, it’s essential to diagnose the issue correctly. Here’s how you can do it:

1. Inspect the hammer pin hole for any debris or dirt. Use a cotton swab or compressed air to clean the area.

2. Check the hammer pin for any signs of damage or bending. If the pin is bent, it may need to be replaced.

3. Ensure that the hammer pin is the correct size for your AR-15. Using the wrong size can cause the pin to bind or not fit properly.

4. Check the hammer and sear for any signs of damage or wear. A worn-out hammer or sear can also cause the hammer pin to bind.

Step-by-Step Guide to Fixing the Problem

Once you’ve diagnosed the issue, follow these steps to fix the problem:

1. Remove the magazine and safety selector from the firearm.

2. Disassemble the upper receiver by removing the bolt carrier group, firing pin, and spring.

3. Locate the hammer pin hole in the hammer assembly. Use a hammer and a punch to gently tap the pin out of the hole.

4. Inspect the hammer pin for any damage or debris. Clean the pin and the hole if necessary.

5. Check the hammer and sear for any signs of damage or wear. Replace them if needed.

6. Insert the new or cleaned hammer pin into the hole. Use a hammer and a punch to gently tap the pin into place.

7. Reassemble the upper receiver and test the firearm to ensure that the hammer pin is functioning correctly.

Preventing Future Issues

Prevention is always better than cure. Here are some tips to help you avoid future issues with the hammer pin:

• Regularly clean and maintain your firearm to prevent debris and dirt from accumulating.

• Use the correct size hammer pin for your AR-15.

• Handle your firearm with care and avoid applying excessive force when assembling or disassembling it.

• Inspect your firearm regularly for signs of wear and damage.

Conclusion

Dealing with an AR-15 hammer pin that won’t go in can be frustrating, but with the right knowledge and tools, you can resolve the issue efficiently. By following this comprehensive guide, you’ll be able to diagnose the problem, fix it, and prevent future occurrences. Always remember to handle your firearm with care and maintain it regularly to ensure safe and reliable performance.