An AR-15 trigger that fails to reset is a serious malfunction, rendering your firearm unsafe and unreliable. This issue prevents the weapon from firing again after the initial shot, leaving you vulnerable in a self-defense situation or causing significant frustration on the range. This comprehensive guide will delve into the common causes of this problem, provide effective troubleshooting steps, and offer potential solutions to get your AR-15 back up and running smoothly.
Understanding the AR-15 Trigger Mechanism
Before diving into troubleshooting, it's crucial to understand the basic mechanics of an AR-15 trigger group. The trigger's function is to release the hammer, initiating the firing sequence. The reset involves the trigger returning to its original position, allowing for subsequent shots. A failure to reset often stems from interference within this intricate system.
Key Components Involved in Resetting:
- Hammer: The hammer strikes the firing pin, igniting the primer.
- Disconnector: Prevents the hammer from falling unless the trigger is fully reset.
- Trigger: The component manipulated by the shooter to initiate the firing sequence.
- Hammer Spring: Returns the hammer to its cocked position.
- Trigger Pins: Secure the trigger and hammer pin to the lower receiver.
Common Reasons for AR-15 Trigger Not Resetting
Several factors can contribute to a trigger failing to reset. Let's examine the most frequent culprits:
1. Dirty or Damaged Trigger Components:
- Buildup of debris: Dirt, carbon fouling, and other debris can impede the smooth movement of the trigger components, hindering the reset mechanism.
- Damaged or worn parts: Excessive use or improper cleaning can lead to wear and tear on the trigger, disconnector, or other components. Bent or broken parts are common causes.
2. Improper Trigger Installation:
- Incorrect trigger pin placement: Improper installation of the trigger pins can misalign parts and prevent the trigger from resetting.
- Loose or bent trigger components: If the trigger group wasn't installed correctly, parts might be loose or even slightly bent.
3. Issues with the Disconnector:
- Broken or damaged disconnector: A malfunctioning disconnector is a frequent cause of reset issues.
- Disconnector interference: The disconnector might be catching or interfering with other parts, preventing smooth operation.
4. Issues with the Hammer Spring:
- Weak or broken hammer spring: A weak spring might not provide enough force to fully cock the hammer, creating interference with reset.
5. Out-of-spec Parts:
- Aftermarket parts incompatibility: Using aftermarket parts that aren't fully compatible with your AR-15's receiver can lead to functional problems.
Troubleshooting Steps:
- Thorough Cleaning: Disassemble the trigger group and thoroughly clean all components with a suitable gun cleaning solvent. Pay close attention to removing any built-up debris.
- Visual Inspection: Carefully examine each part for damage, wear, or any signs of bending or breakage. Replace any damaged components.
- Re-Installation: Carefully reinstall the trigger group, ensuring proper alignment and secure seating of all pins. Refer to a reputable guide or video for correct reassembly.
- Functional Test: Test the trigger functionality in a safe environment. If the problem persists, continue with more in-depth checks.
- Disconnector Check: Focus on the disconnector. Ensure it moves freely and doesn't interfere with other components. Consider replacing it if needed.
- Hammer Spring Check: Inspect the hammer spring for strength and proper tension. Replace it if it appears weakened or damaged.
Seeking Professional Help:
If you've followed the troubleshooting steps and the trigger still doesn't reset, consider seeking professional help from a qualified gunsmith. A gunsmith possesses the expertise to diagnose more complex issues and repair or replace components accurately.
Disclaimer: Working on firearms requires caution and proper safety procedures. Always handle firearms responsibly and ensure that the firearm is unloaded before any cleaning or maintenance is performed. This guide provides general information and should not be considered a substitute for professional gunsmithing services. Improper handling of firearms can result in serious injury or death.
