AR-15s are popular for their modularity and customizability, but sometimes things go wrong. One frustrating issue is a trigger that fails to reset properly, leading to dangerous malfunctions and impacting accuracy. This comprehensive guide explores the common causes of an AR-15 trigger not resetting, providing step-by-step troubleshooting and solutions. We'll cover everything from simple fixes to more involved repairs, ensuring you can get your rifle back up and running safely.
Understanding the AR-15 Trigger Mechanism
Before diving into troubleshooting, it's crucial to understand how an AR-15's trigger mechanism works. The trigger group is a complex interplay of parts including the trigger, hammer, disconnector, and trigger pins. When the trigger is pulled, it releases the hammer, firing the round. The disconnector plays a vital role in ensuring the trigger resets, preventing accidental double-fires. A failure in any of these components can result in a trigger that doesn't reset.
Common Causes of AR-15 Trigger Not Resetting
Several factors can cause an AR-15 trigger to fail to reset. These include:
- Dirty or Damaged Trigger Components: Accumulated dirt, debris, or damage to the trigger, hammer, or disconnector can impede their proper function.
- Improper Trigger Installation: Incorrect installation of the trigger group or individual components is a frequent source of malfunction. This is especially true for aftermarket triggers.
- Bent or Broken Parts: A bent or broken disconnector, hammer, or trigger can prevent the trigger from resetting.
- Incorrect Hammer Spring Tension: A weak or improperly installed hammer spring can hinder the hammer's return to its cocked position, causing reset failure.
- Improperly Installed or Damaged Trigger Pins: Loose or damaged trigger pins can destabilize the trigger group and prevent proper reset.
- Out-of-spec parts: Using parts that aren't properly manufactured to spec can lead to malfunctions.
Troubleshooting Your AR-15 Trigger Reset Issue
Troubleshooting should always begin with safety. Always ensure the firearm is unloaded and clear before any maintenance or repair. Follow these steps to diagnose the problem:
Step 1: Visual Inspection
Carefully inspect the entire trigger group for any visible damage, dirt, or debris. Use a cleaning rod and solvent to clean out any visible obstructions. Pay close attention to the disconnector, hammer, and trigger. Look for any bent, broken, or worn components.
Step 2: Functional Check (with an unloaded weapon!)
With the weapon completely unloaded and clear, manually manipulate the trigger group. Cycle the action and observe how each part moves. Does the hammer fall smoothly? Does the disconnector engage and disengage correctly? Any hesitation or binding could indicate a problem.
Step 3: Disassemble and Clean
If you find any debris or if the visual inspection reveals nothing, completely disassemble the trigger group. Use a suitable cleaning solvent and brush to thoroughly clean all components. Pay special attention to the disconnector and hammer engagement points. Inspect each part for wear, damage, or deformation.
Step 4: Inspect and Replace Parts
After cleaning, carefully examine each component again, looking for any irregularities. If any parts are bent, broken, or show excessive wear, they should be replaced with new, high-quality parts. Never use a part if there is any doubt about its integrity.
Step 5: Reassembly and Testing
Once all components are clean and inspected, reassemble the trigger group, paying close attention to proper orientation and alignment of each part. Follow your manufacturer's instructions or a reputable guide. After reassembly, test the trigger mechanism again with an unloaded firearm to ensure the problem is resolved.
Case Study: A Real-World Example
A shooter experienced an AR-15 trigger not resetting after installing a new aftermarket trigger. Upon inspection, it was discovered that one of the trigger pins was slightly bent, preventing proper hammer engagement. Replacing the pin resolved the issue immediately. This highlights the importance of properly installing and inspecting all components, even when using new parts.
Preventing Future Trigger Reset Problems
Regular maintenance is key to preventing issues with your AR-15 trigger. Regular cleaning and lubrication of the trigger group are recommended, as is a periodic inspection for wear and tear. Avoid using excessive force when manipulating the trigger group. Using high-quality parts and installing them correctly are crucial for reliable functioning.
Conclusion: Ensuring Safe and Reliable AR-15 Function
An AR-15 trigger that doesn't reset is a serious safety hazard. By understanding the trigger mechanism and following these troubleshooting steps, you can identify and resolve this problem effectively. Remember, safety is paramount. Always ensure your firearm is unloaded before performing any maintenance or repair. If you're unsure about any step, seek the assistance of a qualified gunsmith.