The AR-15 platform's popularity stems partly from its modularity and relative ease of maintenance. Even seemingly minor components like the trigger spring play a crucial role in the rifle's reliable function. This in-depth guide will explore the AR-15 trigger spring, covering its purpose, different types available, common issues, and how to troubleshoot problems. Understanding this seemingly small part is key to ensuring your AR-15 functions safely and accurately.
The Role of the AR-15 Trigger Spring
The AR-15 trigger spring is a small but vital component located within the lower receiver, specifically within the trigger group. Its primary function is to return the trigger to its reset position after the trigger is pulled and the firing pin has struck the primer. Without a functioning trigger spring, the trigger would remain depressed, preventing subsequent shots and potentially leading to malfunctions. This simple mechanism ensures the firearm is ready to fire again once the bolt carrier group completes its cycle. The spring's tension is carefully calibrated to ensure a consistent and reliable trigger pull.
Understanding Trigger Spring Tension
The tension of the AR-15 trigger spring directly impacts the trigger pull weight and reset length. A stronger spring will result in a heavier trigger pull, while a weaker spring will result in a lighter pull. The reset length refers to the distance the trigger travels back before it is ready to fire again. A properly functioning trigger spring ensures both a consistent trigger pull and a reliable reset, crucial for accurate and rapid fire. Improper tension can lead to light or heavy trigger pulls, potentially impacting accuracy and safety.
Types of AR-15 Trigger Springs
While the basic function remains consistent, subtle variations in AR-15 trigger springs exist. These differences might be in the material used, the spring's wire diameter, or the overall length. These seemingly minor changes can significantly affect the trigger's performance and feel.
Standard Trigger Springs
These are the most common type of AR-15 trigger springs. They offer a balance between trigger pull weight, reset length, and reliability. They are generally made from high-quality spring steel designed to withstand considerable use and abuse. Standard springs typically provide a trigger pull weight within the typical range for a standard AR-15.
Enhanced/Upgraded Trigger Springs
Many aftermarket manufacturers offer enhanced or upgraded trigger springs. These often feature modifications that aim to improve the feel of the trigger, reduce the trigger pull weight, or adjust the reset length. These upgrades might involve a different spring material, a change in the spring's coil configuration, or a variation in spring strength. However, it's critical to choose a reputable manufacturer to avoid compromising safety and reliability.
Choosing the Right Spring
Selecting the correct trigger spring depends heavily on your needs and preferences. A lighter trigger pull can improve shooting accuracy and speed for experienced shooters, but it also increases the risk of accidental discharge if proper trigger discipline isn’t maintained. A heavier trigger pull may be preferable for novice shooters who are still developing their shooting technique. Always prioritize safety when modifying or replacing trigger components. Improperly installed or inappropriate springs can severely impair the function and safety of your AR-15.
Troubleshooting Common AR-15 Trigger Spring Issues
While generally robust, AR-15 trigger springs can eventually wear out or become damaged. This can manifest in several ways.
Problem: Trigger Feels Heavy or Sluggish
Possible Cause: Worn or weak trigger spring. The spring may have lost its elasticity over time, resulting in an increased trigger pull weight.
Solution: Replace the trigger spring with a new one. Ensure you're using a replacement of the same specifications as the original.
Problem: Trigger Doesn't Reset Properly
Possible Cause: The spring might be broken, too weak, or incorrectly installed. This can prevent the trigger from returning to its firing position.
Solution: Inspect the spring for damage. If broken, replace it. If it appears intact but still malfunctions, double-check its proper installation and consider the possibility of another component's fault within the trigger group.
Problem: Trigger Pull Feels Inconsistent
Possible Cause: The spring may be bent or deformed, causing inconsistent trigger pull weight. Dirt or debris in the trigger group can also impact performance.
Solution: Carefully inspect the spring for damage. Clean the trigger group thoroughly to remove any dirt or debris that could interfere with the spring's function. Replace the spring if it's damaged.
Safety Precautions When Working on Your AR-15 Trigger Group
Always ensure your firearm is unloaded and the bolt carrier group is removed before working on any internal components, including the trigger spring. Handle the trigger spring with care, as it is a small and easily lost part. If you are uncomfortable performing this maintenance yourself, seek the assistance of a qualified gunsmith. Improperly installing or modifying trigger components can lead to malfunctions and serious injury.
Disclaimer: This information is for educational purposes only. Always consult a qualified gunsmith for any modifications or repairs to your firearm. Safe gun handling practices should always be followed.